JP4769235B2 - Radiation measuring instrument - Google Patents

Description

  The present invention relates to a radiation measuring instrument that measures radiation, and more particularly to a radiation measuring instrument in which a detection unit is detachably attached to a main body.

  Among those collectively referred to as radiation measuring instruments, there are portable ones. A portable radiation measuring instrument is used, for example, when measuring radiation on the surface of various structures such as buildings and vehicles in addition to the body surface (for example, Patent Documents 1-4 below). Such a radiation measuring instrument generally includes a main body having a display, an arithmetic circuit, a battery, and the like, and a detection unit that is detachably attached thereto. The detection unit is further roughly divided into a detection unit provided with a planar radiation sensor and a gripping unit gripped by a user. Usually, the gripping part is detachable from the handle part of the main body part, and the detection part is fixed to one end of the gripping part. In other words, the posture of the detection unit with respect to the gripping unit is conventionally constant.

JP 2005-77380 A Utility Model Registration No. 3081493 JP 2001-4756 A JP 2005-241595 A

  Since the posture of the detection unit with respect to the gripping portion does not change, conventionally, an inspector holding the detection unit has to change the posture according to the position, shape, etc. of the inspection object. At this time, depending on the type of the inspection object, the inspector may be forced to take an unreasonable posture. For example, when inspecting surface contamination of a vehicle, it is necessary to bring the detection unit close to the fender of the vehicle. However, there are many other structures around the fender of the vehicle. Therefore, in order to bring the detection unit close to the fender, it is necessary for the inspector to take various postures and, in some cases, an unreasonable posture for the inspector so as to avoid other structures. It was a burden. Further, when inspecting surface contamination of a relatively simple structure, for example, a floor surface or a wall surface of a building, it is not necessary for the inspector to greatly change the posture. However, in other words, it is necessary for the inspector to maintain the same posture for a long time, which is also a burden on the inspector.

  The prior art does not consider the burden on the inspector caused by the fixed posture of the detection unit. Patent Document 1 discloses a survey meter (radiation measurement device) in which the posture of the detection unit is variable. However, in this patent document 1, the detection part is only rotatable around the grip part. The rotation of the detection unit with the gripping unit as the center has little meaning when the gripping unit is detached from the main body unit, and does not affect the posture of the operator at the time of detection. Therefore, with the technique of Patent Document 1, the burden on the posture of the inspector as described above cannot be reduced. Further, Patent Document 2 discloses a survey meter that can change the posture of the handle of the main body to which the gripping unit is attached, but this is merely considering the storage capacity of the survey meter, The burden on posture is not considered. In other words, the conventional technology does not consider the problem of the burden on the inspector at the time of the inspection.

  Therefore, an object of the present invention is to provide a radiation measuring instrument that can be more comfortably inspected.

The radiation measuring instrument of the present invention is a radiation measuring instrument comprising: a main body; and a detection unit that is attached to the main body and is gripped by a user in a state of being detached from the main body at the time of radiation measurement. Includes a detection unit having a detection surface for detecting radiation, a detachable attachment to the main body unit, and a grip unit gripped by a user, and the detection surface and the center line direction of the grip unit. An elevation angle posture adjustment unit that adjusts an elevation angle that is an angle, and the elevation angle posture adjustment unit holds the detection surface in a state in which the elevation angle is variable with respect to the grip portion, and the grip An engagement member for elevation angle that is connected to a member and restricts movement of the detection surface in the elevation angle direction by engaging with the holding member for elevation angle, and can be moved forward and backward in the release direction of the engagement. From members and users Depending on the operation, characterized in that it comprises a regulating member for regulating the movement in the disengagement direction of the elevation engagement member.

In While the previous SL elevation holding member and the elevation engaging member, elevation pins are protruded on the other of said elevation holding member and the elevation engaging member preferred embodiment, It is desirable that a plurality of elevation angle pin holes into which the elevation angle pins are inserted and engaged are formed. Further, it is desirable that the elevation angle adjusting means further includes an elevation angle biasing means for biasing the engagement member in the engagement direction .

In another preferred embodiment, the detecting unit further adjusts the attitude of the detection surface for the turning angle is a turning angle of the detection plane about an axis perpendicular to the detection surface in said detection plane turning Angular posture adjustment means is provided. In this case, the turning angle posture adjusting means is connected to the turning angle holding member for holding the detection surface in a state of being turnable with respect to the holding part, and to the holding part for the turning angle. a turning angle engagement member for limiting pivoting with respect to the grip portion of the detection surface by engaging, it is desirable to provide a corresponding engagement releasing direction in engagement for retractably pivot angle coupling member, the . Further, a pivot angle pin protrudes from one of the pivot angle holding member and the pivot angle engagement member, and the other of the pivot angle holding member and the pivot angle engagement member It is desirable that a plurality of pivot angle pin holes into which the pivot angle pins are inserted and engaged are formed.

  In another preferred aspect, the turning angle engaging member releases the engagement with the turning angle holding member in conjunction with the release of the engagement between the elevation angle engaging member and the elevation angle holding member. To do. In this case, the turning angle adjusting means further includes turning angle urging means for urging the turning angle engaging member in a direction of releasing the engagement, and the elevation angle engaging member is the elevation angle. It is desirable to press the turning angle urging means in the engaging direction against the urging force of the turning angle urging means when engaged with the holding means.

  In another preferable aspect, it is further desirable to include an extended grip part that is detachably attached to a rear end of the grip part and is gripped by a user when the grip part is attached to the grip part.

  According to the present invention, it is possible to adjust the elevation angle, which is the angle formed between the detection surface and the grip portion. Therefore, the burden on the posture of the inspector can be reduced, and the surface contamination and the like can be more comfortably inspected.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a survey meter 10 according to an embodiment of the present invention. Moreover, FIG. 2 is the perspective view which looked at the said survey meter 10 from the other direction. This survey meter 10 is used for inspection of surface contamination of various structures by radiation, for example, α rays and β rays, and is a portable radiation measuring instrument with a built-in battery.

  The survey meter 10 is roughly divided into a main body 12 having a battery, a display, an arithmetic circuit, and the like, and a detection unit 14 detachably attached to the main body 12. A substantially arched handle 20 is formed from the upper end of the main body 12, and a mounting mechanism for detachably mounting the detection unit 14 is formed on the upper end surface of the handle 20. In addition, since the well-known well-known technique can be applied to specific configurations of the main body 12 and the mounting mechanism, detailed description thereof is omitted here.

  The detection unit 14 is roughly classified into a grip 16 that is gripped by a user and a detection unit 18 that includes a scintillator 23 that is a planar radiation sensor. When inspecting the surface contamination of various structures, the inspector grips the gripping part 16 with his / her hand, separates the detection unit 14 from the main body part 12, and touches the surface of the scintillator 23 which is the detection surface 22 of the inspection object. Move closer.

  Here, at the time of the surface contamination inspection, if the posture of the detection unit 18 with respect to the gripping unit 16 is unchanged, the detection unit 18 is positioned in the vicinity of the inspection target according to the shape and position of the inspection target. , The examiner must change posture. As a result, depending on the position and shape of the object to be inspected, it may be necessary to take a posture that is difficult for the inspector, or it may be necessary to maintain a constant posture for a long time. there were. Therefore, in the present embodiment, the configuration of the detection unit 14 is special, and the posture of the detection unit 18 with respect to the gripping unit 16 can be changed. Specifically, the detection unit 18 can be pivoted about an axis orthogonal to the detection surface 22 (K axis in FIGS. 1 and 2), and the major axis of the grip 16 and the axis orthogonal to the K axis (FIG. 1). , And is rotatable about the L axis in FIG. Hereinafter, the configuration of the detection unit 18 of the survey meter 10 will be described in detail.

  3 is a top view of the detection unit 14 with a part broken away, FIG. 4 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 5 is a cross-sectional view taken along the line BB in FIG. FIG. 6 is a front view illustrating the detection unit 14 with a part thereof broken. Further, FIG. 7 is a top view of the detection unit 14 in a state where the posture of the detection unit 18 is freely changeable. In the following description, a direction from the detection unit 18 toward the grip unit 16 is referred to as a “retraction direction”, and a direction from the grip unit 16 toward the detection unit 18 is referred to as an “advance direction”.

  As already described, the detection unit 14 is roughly divided into a gripping part 16 and a detection part 18. The gripping portion 16 is a substantially round bar-like member, and a mounting portion 24 to be attached to the handle portion 20 of the main body portion 12 is provided on the side surface thereof. An advancing / retreating ring 26 and a connection ring 28 are inserted in the vicinity of the tip of the gripping portion 16. The connection ring 28 is an annular body that can be moved forward and backward with respect to the grip portion 16. A step is formed on the inner peripheral surface of the connection ring 28, and when the connection ring 28 moves in a retracting direction for a certain distance, the step corresponds to the step formed on the outer periphery of the gripping portion 16. It comes to touch. Due to this contact relationship, the retracted amount of the connection ring 28 is limited. A coil spring 32 is disposed in the gap between the inner peripheral surface of the connection ring 28 and the outer peripheral surface of the gripping portion 16 to urge the outer arm 30 described later in the advance direction. Further, an advancing / retreating ring 26 is provided immediately behind the connection ring 28 (retracting direction side).

  The advancing / retreating ring 26 is an annular body having an internal thread formed on the inner peripheral surface thereof, and is threadably connected to an external thread formed on the outer periphery of the gripping portion 16. And by this screwing relationship, the advance / retreat ring 26 is adapted to advance and retract along the grip portion 16 by rotating. The advancing / retracting ring 26 is provided to restrict the retracting operation of the connection ring 28. That is, the forward / backward ring 26 has an inner diameter and an outer diameter so as to contact the rear end of the connection ring 28 that moves in the retracting direction. Therefore, when the advance / retreat ring 26 has not been moved in the retracting direction in advance, the connection ring 28 that is about to move in the retracting direction comes into contact with the tip of the advance / retreat ring 26 and the retracting operation is hindered. The In other words, when it is desired to retract the connection ring 28 and thus the outer arm 30 fixed to the connection ring 28, the inspector must retract the advance / retreat ring 26 in advance by a rotation operation.

  Here, the reason for providing the advancing / retracting ring 26 for restricting the retracting operation of the connecting ring 28 and by extension the outer arm 30 fixed to the connecting ring 28 is to prevent the retracting of the outer arm 30 unintended by the inspector. is there. That is, as will be described in detail later, when the outer arm 30 is retracted, the posture of the detection unit 18 with respect to the gripping unit 16 can be changed. An unintentional change in the posture of the detection unit 18 not only interferes with the surface contamination inspection work, but may possibly cause a failure of the detection unit 14 due to a collision with another member. Therefore, in the present embodiment, when there is no inspector's conscious operation of turning the advance / retreat ring 26, the retracting operation of the connection ring 28 and the outer arm 30 is inhibited, and the posture change of the detection unit 18 is inhibited. An advance / retreat ring 26 is provided.

  A pair of outer arms 30 are fixed to the front end surface of the connection ring 28. Each outer arm 30 extends toward the detection unit 18, and can move forward and backward with respect to the gripping unit 16 together with the connection ring 28. An elevation angle pin 34 projects from the distal end surface of the outer arm 30. The elevation angle pin 34 is an engagement member for elevation angle that engages with a part of the detection unit 18 to regulate a change in the posture of the detection unit 18 with respect to an elevation angle that is an angle formed by the detection surface 22 and the gripping unit 16. . Specifically, when the outer arm 30 moves in the advance direction, the elevation angle pin 34 is inserted into and engaged with an elevation angle pin hole 38 formed in a substantially cylindrical portion 36 described later. On the other hand, when the outer arm 30 moves in the retracting direction, the elevation angle pin 34 is detached from the elevation angle pin hole 38 and the engagement relationship is released. That is, the engagement relationship between the elevation angle pin 34 and the elevation angle pin hole 38 can be released in accordance with the advance / retreat of the outer arm 30.

  An inner arm 40 is provided inside the outer arm 30. The inner arm 40 is a substantially U-shaped member fixed to the distal end surface of the gripping portion 16, and includes a pair of inner arm pieces 42 facing each other, a connecting piece 44 connecting the pair of inner arm pieces 42, and It has. Since the inner arm 40 is fixed to the grip portion 16, the posture with respect to the grip portion 16 remains unchanged. The pair of inner arm pieces 42 constituting the inner arm 40 are provided with a slight inclination so that the facing distance gradually increases as the distance between them approaches the tip (advancing direction side). From another viewpoint, each inner arm piece 42 is inclined with respect to the outer arm 30 disposed on the outer side. In the vicinity of the tip of the inner arm piece 42, a turning pin 46 that functions as a turning engagement member is inserted. The turning pin 46 is a pin that can be engaged with a turning pin hole 52 formed in a turning cylinder 50 described later. The inner arm piece 42 functions as a turning urging means that urges the turning pin 46 that functions as the turning engagement member in the outward direction. That is, the inner arm 40 including the inner arm piece 42 is made of a thin metal material. The inner arm piece 42 that is in a cantilevered state by the connection piece 44 functions as a leaf spring having appropriate elasticity. Due to the urging force of the inner arm piece 42 functioning as the leaf spring, the turning pin 46 is moved in the outward direction, in other words, in a direction away from the turning pin hole 52. However, the action state of the urging force on the turning pin 46 varies depending on the advance / retreat state of the outer arm 30 arranged outside the inner arm piece 42. This will be described with reference to FIG. 8A and 8B are diagrams schematically showing the state of elastic deformation of the inner arm piece 42, where FIG. 8A shows a state in which the outer arm 30 has advanced, and FIG. 8B shows a state in which the outer arm 30 has been retracted. ing.

  As shown in FIG. 8A, in a state where the outer arm 30 has advanced, in other words, in a state where the elevation angle pin 34 is engaged with the elevation angle pin hole 38, the tip of the outer arm 30 is the inner arm piece. 42 abuts against the side surface of the inner arm piece 42 to prevent the tip of the inner arm piece 42 from excessively spreading outward. In other words, the inner arm piece 42 is pressed inward by the outer arm 30. As a result, the turning pin 46 inserted through the inner arm piece 42 is positioned inward, and the turning pin 46 is engaged with the turning pin hole 52. In other words, when the elevation pin 34 and the elevation pin hole 38 are engaged, the turning pin 46 and the turning pin hole 52 are also engaged.

  On the other hand, as shown in FIG. 8B, in a state where the outer arm 30 is retracted, in other words, in a state where the elevation angle pin 34 is detached from the elevation angle pin hole 38, the outer arm 30 is ) In the retracting direction side of the state shown in FIG. In other words, when the outer arm 30 is retracted, the contact position between the outer arm 30 and the inner arm piece 42 is moved in the retracting direction. In this case, the inner arm piece 42 is deformed so as to spread outward by an elastic restoring force. As a result, the tip of the inner arm piece 42 moves outward together with the turning pin 46, and the engagement relationship between the turning pin 46 and the turning pin hole 52 is released. In other words, when the engagement between the elevation pin 34 and the elevation pin hole 38 is released, the engagement between the turning pin 46 and the turning pin hole 52 is also released. In other words, in the present embodiment, the engagement state of the elevation pin 34 and the elevation pin hole 38, and the turning pin 46 and the turning pin 46 are always interlocked. As a result, the examiner can simultaneously disengage the two pins, that is, the elevation angle pin 34 and the turning pin 46 by one operation of retracting the outer arm 30, and the posture of the detection unit 18 can be easily operated. Changes can be made.

  Of course, the engagement states of the pins 34 and 46 do not necessarily have to be interlocked, and may be disengaged by different operations. For example, in the present embodiment, the interlocked disengagement of the elevation angle pin 34 and the turning pin 46 is realized by using the elastic force of the inner arm piece 42. However, in order to realize such interlocked disengagement, adjustment of the elastic force of the inner arm piece 42 may be delicate and difficult. In that case, the turning pin 46 may be engaged and released by the hand of the inspector. That is, when it is desired to release the engagement of the turning pin 46, the inner arm piece 42 is pressed outward by the examiner's hand, and when the turning pin 46 is to be engaged, the turning pin 46 is engaged. The head may be pressed inward by the examiner's hand.

  Again, the configuration of the detection unit 14 will be described with reference to FIGS. The detection unit 18 includes a flat plate scintillator 23 that is a planar radiation sensor. The scintillator 23 is housed on the bottom surface of a substantially quadrangular pyramid sensor case 54, and the bottom surface of the sensor case 54 serves as the detection surface 22. A substantially cylindrical cylindrical portion 56 extends from the upper end of the sensor case 54. The cylindrical portion 56 accommodates electronic components such as a PMT 58 that converts the detection result of the scintillator 23 into an electric signal, and an electronic circuit that controls the driving of the PMT 58 and the like. The cylindrical portion 56 includes a plurality of cylindrical bodies, that is, a turning cylinder 50, a holding cylinder 60, a fixed cylinder 62, and a small diameter cylinder 64.

  The swivel cylinder 50 is a cylinder whose base end is fixed to the sensor case 54. The swivel tube 50 is rotatable with respect to the fixed tube 62, the small diameter tube 64, the holding tube 60 and the substantially cylindrical portion 36 together with the sensor case 54, and serves as a swivel holding member that holds the detection unit 18 in a swivelable manner. Function. Specifically, sliding pins 50 a and 50 b projecting outward and inward are formed at the upper end of the swivel cylinder 50, and the sliding pins 50 a and 50 b are formed on the inner peripheral surface of the fixed cylinder 62 and the holding surface. The cylinder 60 is inserted into a sliding groove formed on the inner circumferential surface over the entire circumference. Further, on the outer peripheral surface of the swivel cylinder 50, a sliding groove into which a sliding pin 36a protruding from a substantially cylindrical portion 36 described later is inserted is formed over the entire circumference. Then, as the sliding pins 50a, 50b, and 36a slide along the sliding grooves, the turning cylinder 50 turns with respect to the holding cylinder 60, the fixed cylinder 62, and the substantially cylindrical portion 36. When the turning cylinder 50 turns, naturally, the sensor case 54 and the detection surface 22 fixed to the turning cylinder 50 also turn, and the attitude of the detection surface 22 with respect to the turning angle can be freely changed. .

  A plurality of turning pin holes 52 into which the turning pins 46 are inserted are formed on the outer peripheral surface of the turning cylinder 50 at a predetermined pitch (for example, at intervals of 30 degrees). As described above, the turning pin 46 is a pin inserted in the vicinity of the tip of the inner arm 40 piece, and is a pin that is movable forward and backward with respect to the turning cylinder 50. When the turning pin 46 is inserted into and engaged with one of the plurality of turning pin holes 52, turning of the turning cylinder 50, and hence the detection surface 22 and the sensor case 54 is hindered.

  The holding cylinder 60 is a cylinder arranged inside the turning cylinder 50 and holds electronic components such as the PMT 58. As described above, the holding cylinder 60 does not turn even when the turning cylinder 50 turns. In other words, the presence of the holding cylinder 60 prevents the electronic component from turning. The reason why the electronic component is prevented from turning is to prevent the signal line 59 drawn from the electronic component from being entangled or twisted. That is, when the electronic component turns together with the detection surface 22 or the like, naturally, the signal line 59 drawn from the electronic component also turns. However, the other end of the signal line 59 is connected to the non-turning main body 12. When one end of the signal line 59 connected to the non-turning main body 12 is turned, the signal line 59 is twisted or entangled. Then, there is a possibility that the signal line 59 may be disconnected due to the pulling force generated by the twisting or entanglement. Therefore, in the present embodiment, the electronic component is held by the holding cylinder 60 that does not rotate even when the detection surface 22 rotates, and the signal line 59 drawn from the electronic component is prevented from being twisted or entangled.

  The fixed cylinder 62 is a cylinder arranged in order on the upper side of the revolving cylinder 50, and the small diameter cylinder 64 is arranged on the upper side of the fixed cylinder 62. The small diameter cylinder 64 is a cylinder having a slightly smaller diameter than the fixed cylinder 62, and the signal line 59 is drawn to the outside from the side surface. Similarly to the holding cylinder 60, the fixed cylinder 62 and the small diameter cylinder 64 do not rotate even when the detection surface 22 or the like rotates. Therefore, entanglement, twisting, and the like of the signal line 59 drawn out from the small diameter cylinder 64 are surely prevented.

  A substantially cylindrical portion 36 is provided outside the cylindrical portion 56. The substantially cylindrical portion 36 has a substantially semi-cylindrical central portion centered on an axis (elevation angle axis) orthogonal to the major axis of the gripping portion 16 and the central axis (swivel axis) of the cylindrical portion 56. In order to accommodate, it has a large cutout shape. From another point of view, the substantially columnar portion 36 includes a pair of disk bodies arranged to face the side surfaces of the cylindrical portion 56 and a connection body that connects the pair of disk bodies. As described above, the substantially cylindrical portion 36 is connected to the turning cylinder 50 via the sliding pin 36a.

  Further, the substantially cylindrical portion 36 is connected to the gripping portion 16 via a turning pin 46 and an inner arm 40 inserted through the disc body portion, and is connected to the gripping portion 16 with the turning pin 46 as a central axis. And can be rotated freely. When the substantially cylindrical portion 36 is rotated around the turning pin 46, the cylindrical portion 56 and the detection surface 22 connected to the substantially cylindrical portion 36 are naturally rotated around the turning pin 46. become. And the elevation angle which is an angle which the detection surface 22 and the holding part 16 comprise is changed by this rotation. That is, the substantially cylindrical portion 36 functions as an elevation angle holding member that holds the detection surface 22 in a state where the posture of the elevation angle can be freely changed.

  The upper surface of the substantially cylindrical portion 36 is an arc surface, and a plurality of elevation angle pin holes 38 into which the elevation angle pins 34 are inserted are formed at a predetermined pitch (for example, at intervals of 15 degrees). When the elevation pin 34 is detached from the elevation pin hole 38, the substantially cylindrical portion 36 is rotatable about the turning pin 46, and the attitude of the detection surface 22 with respect to the elevation angle can be adjusted. On the other hand, when the elevation angle pin 34 is inserted into and engaged with the elevation angle pin hole 38, the substantially cylindrical portion 36, and thus the cylindrical portion 56 connected to the substantially cylindrical portion 36 and the sensor case 54. The rotation operation with respect to the grip portion 16 is hindered, and the posture with respect to the elevation angle is fixed.

  Next, how the posture of the detection unit 18 in the detection unit 14 is adjusted will be described. Normally, the elevation pin 34 and the turning pin 46 are inserted into the corresponding pin holes 38 and 52, respectively, and the posture of the detecting unit 18 with respect to the gripping unit 16 is fixed.

  When it is desired to change the posture of the detection unit 18 with respect to the grip unit 16, the inspector rotates the advance / retreat ring 26 attached to the grip unit 16 and moves the advance / retreat ring 26 in the retracting direction. When the advance / retreat ring 26 is retracted, the retracting operation of the connection ring 28 mounted in front of the advance / retreat ring 26 and the outer arm 30 fixed to the connection ring 28 is allowed. However, in a state in which the advance / retreat ring 26 is merely retracted, the outer arm 30 is biased in the advance direction by the coil spring 32, so that the engagement relationship between the elevation angle pin 34 and the elevation angle pin hole 38 is maintained. Has been. Accordingly, after the inspector retracts the advancing / retreating ring 26, the inspector applies a force in the retracting direction to the outer arm 30 or the connection ring 28, and resists the urging force of the coil spring 32 on the outer arm 30 and the connection ring 28. To move in the retreat direction.

  As the outer arm 30 is retracted, the elevation angle pin 34 formed on the front end surface of the outer arm 30 is detached from the elevation angle pin hole 38 formed on the upper surface of the substantially cylindrical portion 36. As a result, the entire detection unit 18 including the substantially cylindrical portion 36 is rotatable about the turning pin 46 inserted through the substantially cylindrical portion 36 as a central axis. And by this rotation, the elevation angle which is an angle formed by the detection surface 22 and the grip portion 16 can be freely changed.

  Further, as the outer arm 30 is retracted, the tip of the inner arm piece 42 that has been pressed inward by the outer arm 30 becomes free, and the tip of the inner arm piece 42 moves outward by the elastic restoring force. By the movement of the inner arm piece 42 in the outer direction, the turning pin 46 inserted through the inner arm piece 42 also moves in the outer direction and is detached from the turning pin hole 52 formed in the turning cylinder 50. . As a result, the turning cylinder 50, the sensor case 54, and the scintillator 23 can turn with respect to the fixed cylinder 62, the substantially cylindrical portion 36, and the gripping portion 16. By this turning, the posture of the detection surface 22 can be freely changed with respect to the turning angle. That is, in this embodiment, by retracting the connection ring 28 and the outer arm 30, the posture of the detection surface 22 can be changed with respect to both the turning angle and the elevation angle.

  In this state, the inspector moves the detection surface 22 to a desired posture. When the detection surface 22 takes a desired posture, the retracted connection ring 28 and outer arm 30 are moved in the advance direction. When the outer arm 30 advances, the elevation angle pin 34 is inserted into one of the plurality of elevation angle pin holes 38. Then, by inserting the elevation angle pin 34 into the elevation angle pin hole 38, the rotation of the detection unit 18 including the substantially cylindrical portion 36 with respect to the gripping portion 16 is inhibited, and the posture is fixed at that time.

  Further, when the outer arm 30 moves in the advancing direction, the inner arm piece 42 is pressed inward by the tip of the outer arm 30. Then, the turning pin 46 inserted through the tip of the inner arm piece 42 also moves inward. The turning pin 46 that has moved inwardly is inserted into one of the plurality of turning pin holes 52. Thereby, the turning of the turning cylinder 50 is inhibited, and the posture of the detection surface 22 with respect to the turning angle is fixed.

  FIG. 9 is a diagram illustrating a state in which the posture of the detection surface 22 is changed. As is clear from FIG. 9, according to the present embodiment, the posture of the detection surface 22 with respect to the grip portion 16 can be variously changed. As a result, surface contamination can be easily inspected at various locations. For example, as shown in FIG. 9A, if the elevation angle is reduced and the gripping portion 16 and the detection surface 22 are substantially parallel, a narrow gap such as a horizontal hole formed in the wall is formed. However, the detection unit 14 can be easily inserted. Further, if the elevation angle is increased as shown in FIG. 9B, for example, the detection surface 22 can be easily brought close to a deep surface such as a bottom surface of a deep hole formed on the floor surface. Can do.

  By the way, even if the posture of the detection surface 22 with respect to the gripping part 16 can be adjusted, it is often difficult to inspect a high place or a place far from the standing position of the inspector so that the inspector's hand cannot reach. . Therefore, in order to easily perform an inspection at a place where the hand of the inspector cannot reach, in the present embodiment, the grip portion 16 can be extended. Specifically, an extended gripping portion 70 that is a gripping portion longer than the gripping portion 16 can be attached to the rear end of the gripping portion 16. FIG. 10 is a perspective view of the detection unit 14 with the extended grip 70 attached to the rear end of the grip 16.

  The extended gripping portion 70 is a substantially round bar member, similar to the gripping portion 16, and a grip 72 for reducing slippage of the hand of the inspector is formed at the base end portion thereof. Further, a connecting mechanism 73 for detachably mounting the extended gripping portion 70 to the rear end of the gripping portion 16 is provided at the tip of the extended gripping portion 70. As a specific configuration of the coupling mechanism 73, a known well-known technique can be applied as appropriate. However, in the present embodiment, the insertion cylinder 74 into which the rear end of the gripping portion 16 is inserted and the side surface of the insertion cylinder 74 is rotated. A connecting mechanism 73 is configured by the free fixing lever 76 (see FIGS. 3 and 10). The fixing lever 76 is formed with an engaging portion 76 a that engages with an engaging groove 80 having a semicircular cross section formed at the rear end of the gripping portion 16. With the rear end of the gripping part 16 inserted into the insertion cylinder 74, the fixing lever 76 is rotated, and the engaging part 76 a is engaged with the engaging groove 80 of the gripping part 16. Connection with the unit 70 is achieved. When the extended gripping part 70 is connected, the detection part 18 can be easily brought close to a place away from the standing position of the inspector, and inspections at various places are possible. Further, the gripping portion 16 and the extended gripping portion 70 can be separated by rotating the fixing lever 76 to the opposite side to release the engagement between the engaging portion 76a and the engaging groove 80. Therefore, the inspector can freely adjust the length of the grip portion according to the location of the inspection object.

  In addition, the structure of the connection mechanism 73 demonstrated here is an example, and of course, you may use the connection mechanism of another structure. Moreover, in this embodiment, although the length of the extended holding | grip part 70 is constant, you may make it possible to change the length, for example using an expansion-contraction pipe as the extended holding part 70. FIG.

  As is apparent from the above description, in the present embodiment, the posture of the detection surface 22 with respect to the grip 16, specifically, the posture with respect to the elevation angle and the turning angle can be adjusted. As a result, contamination inspections at various locations can be easily performed. In addition, since the grip 16 can be extended, it is possible to easily inspect a place away from the inspector's standing position. In the present embodiment, the posture adjustment is possible for both the elevation angle and the turning angle, but the posture adjustment may be possible only for the elevation angle. Further, the relationship between the pins and the pin holes may be reversed. For example, a plurality of elevation pin holes may be formed on the distal end surface of the outer arm 30, and one elevation pin may be formed in the substantially cylindrical portion 36. Further, the advance / retreat ring 26 and the coil spring 32 may be omitted as necessary.

It is a perspective view of the survey meter which is an embodiment of the present invention. It is the perspective view which looked at the survey meter from the other direction. It is the top view which fractured | ruptured the detection unit partially. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is the front view which fractured | ruptured the detection unit partially. It is a top view of a detection unit in the state where posture change is possible. It is a schematic diagram which shows the mode of the elastic deformation of an inner arm piece. It is a figure which shows a mode that the attitude | position of the detection surface was changed. It is a figure which shows a mode that the extended holding | grip part was mounted | worn.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Survey meter, 12 Main body part, 14 Detection unit, 16 Grip part, 18 Detection part, 22 Detection surface, 23 Scintillator, 26 Advance / retreat ring, 28 Connection ring, 30 Outer arm, 32 Coil spring, 34 Elevation angle pin, 36 38, pin hole for elevation angle, 42 inner arm piece, 46 pin for turning, 50 turning tube, 52 pin hole for turning, 54 sensor case, 59 signal line, 70 extension gripping part.

Claims (9)

A radiation measuring instrument comprising a main body and a detection unit that is attached to the main body and is gripped by a user in a state of being detached from the main body at the time of radiation measurement,
The detection unit is
A detector having a detection surface for detecting radiation;
A gripping part that is detachable from the main body part and gripped by a user;
Elevation angle adjustment means for adjusting an elevation angle, which is an angle formed by the detection surface and the center line direction of the grip portion;
Equipped with a,
The posture adjustment means for elevation angle includes:
An elevation holding member that holds the detection surface with respect to the grip portion in a state in which the elevation angle is variable;
An elevation angle engagement member that is connected to the grip portion and engages with the elevation angle holding member to limit the movement of the detection surface in the elevation angle direction, and can be moved forward and backward in the disengagement direction of the engagement. An engaging member;
A restricting member for restricting movement of the engagement member for elevation angle in the disengagement direction in accordance with an operation from the user;
Radiation measurement apparatus, characterized in that it comprises a. The radiation measuring instrument according to claim 1 ,
One of the elevation angle holding member and the elevation angle engagement member is formed with an elevation angle pin protruding therefrom,
2. The radiation measuring instrument according to claim 1, wherein a plurality of elevation angle pin holes into which the elevation angle pins are inserted and engaged are formed in the other of the elevation angle holding member and the elevation angle engagement member. The radiation measuring instrument according to claim 1 or 2 ,
The elevation angle posture adjusting means further includes an elevation angle urging means for urging the engagement member in the engagement direction. The radiation measuring instrument according to any one of claims 1 to 3 ,
The detection unit further comprises:
Radiation measurement, comprising: a turning angle posture adjusting means for adjusting a posture of the detection surface with respect to a turning angle that is a turning angle of the detection surface around an axis orthogonal to the detection surface in the detection surface. vessel. The radiation measuring instrument according to claim 4 ,
The turning angle posture adjusting means includes:
A swivel angle holding member that holds the detection surface in a swivelable state with respect to the grip portion;
A swivel angle engaging member that is connected to the gripping part and restricts the swiveling of the detection surface relative to the gripping part by engaging with the swivel angle holding member. A pivoting angle engaging member;
A radiation measuring instrument comprising: The radiation measuring instrument according to claim 5 ,
One of the turning angle holding member and the turning angle engaging member has a turning angle pin protruding therefrom,
Radiation measurement characterized in that a plurality of pivot angle pin holes into which the pivot angle pin is inserted and engaged are formed in the other of the pivot angle holding member and the pivot angle engaging member. vessel. The radiation measuring instrument according to claim 5 or 6 ,
The swivel angle engaging member releases the engagement with the swivel angle holding member in conjunction with the disengagement between the elevation angle engagement member and the elevation angle holding member. Measuring instrument. It is a radiation measuring instrument of Claim 6 , Comprising:
The turning angle posture adjusting means further includes turning angle urging means for urging the turning angle engaging member in a direction to release the engagement.
The engagement member for elevation angle presses the urging means for turning angle in the engagement direction against the urging force of the urging means for turning angle when engaged with the holding means for elevation angle. Characteristic radiation measuring instrument. The radiation measuring instrument according to any one of claims 1 to 8 , further comprising:
A radiation measuring instrument comprising an extended gripping part that is detachably attached to a rear end of the gripping part and gripped by a user when attached to the gripping part.

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