CN110136860B - Fast neutron screening device and screening method - Google Patents
Fast neutron screening device and screening method Download PDFInfo
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- CN110136860B CN110136860B CN201910442753.0A CN201910442753A CN110136860B CN 110136860 B CN110136860 B CN 110136860B CN 201910442753 A CN201910442753 A CN 201910442753A CN 110136860 B CN110136860 B CN 110136860B
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- 238000012216 screening Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims abstract description 5
- 239000012528 membrane Substances 0.000 claims description 40
- 238000001179 sorption measurement Methods 0.000 claims description 17
- 230000000903 blocking effect Effects 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 12
- 230000008602 contraction Effects 0.000 claims description 9
- 229910052580 B4C Inorganic materials 0.000 claims description 3
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
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- G21G4/02—Neutron sources
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Abstract
The invention provides a fast neutron screening device, wherein a scintillator assembly is fully unfolded to form a circular ring, a first motor drives the scintillator assembly to rotate at a constant speed, a neutron generation source emits neutron beams to the incident surface of the scintillator assembly, so that the neutron beams emitted in more than one period can be fully emitted to the scintillator assembly, the scintillator assembly can emit light, an electric signal is generated through a light detector and is sent to a microprocessor, and the fast neutrons are different from other neutrons and have larger energy, so that a light detection element receiving the fast neutrons can emit stronger signals, the microprocessor receives the electric signal and stores and processes the electric signal, and the microprocessor calculates the pulse period of the neutron beam according to the recorded electric signals with regular change.
Description
Technical Field
The invention relates to a fast neutron screening device and a fast neutron screening method.
Background
The spallation neutron source drives high-energy protons to bombard the heavy metal target body through an accelerator, so that neutron beam current with high neutron flux is obtained. Advanced neutron sources are the basis of neutron science research, and can provide necessary tools for researching the microstructure and motion state of substances. The proton accelerates to bombard the tungsten target to generate a pulse neutron beam and also generate a fast neutron beam. The fast neutron beam is emitted at zero time of each neutron beam pulse period, and is transmitted along with the neutron beam, if all the fast neutron beam reaches a sample, a large background can be caused on a test result, neutron beam wave bands required by different researches and experiments are different, so that in the fast neutron beam transmission process, a device is required to filter fast neutrons, and a required pulse neutron beam can be released.
Patent number 2017200036286 discloses a spallation neutron source fast neutron filtering device, but the device disclosed by the patent cannot test the neutron beam pulse period in advance, and the neutron beam pulse period needs to be tested by means of external third party equipment, so that a plurality of inconveniences are brought to the use of equipment.
Disclosure of Invention
Aiming at the problems pointed out in the background technology, the invention provides a fast neutron screening device and a screening method capable of automatically adjusting and filtering fast neutrons by testing the pulse period of neutron beams.
The technical scheme of the invention is realized as follows:
The fast neutron screening device comprises a shell, a neutron generation source, a scintillator assembly and a first motor, wherein the shell is a closed shell, the neutron generation source is arranged at the upper part of one side in the shell, a neutron beam window is arranged on the wall of the shell corresponding to the side of the neutron generation source, the scintillator assembly is vertically arranged at the middle part in the shell, the axle center of the scintillator assembly is positioned at the lower part of the horizontal axis of the neutron generation source, the neutron generation source corresponds to the front position of the scintillator assembly, the first motor is horizontally arranged at the other side in the shell, and a driving shaft of the first motor is connected with the center of the scintillator assembly;
the scintillator component is circular, the scintillator component comprises a scintillator layer, a first framework, a middle framework, a second framework, a circular membrane, a blocking adsorption layer and a second motor, a breaking groove is formed in the membrane along the radial direction of the membrane, the first framework and the second framework are respectively connected with the end parts of the membrane at the two sides of the breaking groove, the middle framework is provided with a plurality of parts, the middle framework is positioned between the first framework and the second framework and is respectively connected with the membrane, the first framework is fixedly connected with a driving shaft, the middle framework and the second framework are rotatably connected with the driving shaft, the scintillator layer is arranged on the front surface of the membrane, the blocking adsorption layer is arranged on the back surface of the membrane, the second motor is fixedly arranged on the driving shaft, and the second motor can drive the second framework to rotate;
The optical detector is provided with a plurality of optical fibers and a plurality of light detection elements, the optical fibers are arranged corresponding to the scintillator layer, the plurality of light detection elements are arranged corresponding to the optical fibers, the light detection elements are connected with the microprocessor, the microprocessor can calculate pulse period information of neutron beam current according to the received electric signals of the plurality of light detection elements, and the microprocessor regulates and controls the rotating speed of the first motor and the rotating angle of the second motor driven second framework according to the pulse period information.
The invention is further arranged to further comprise a touch display connected to the microprocessor.
The invention is further arranged that the upper part of the shell is provided with a vacuumizing tube.
The invention is further provided that a boron carbide adsorption layer is arranged on the inner cavity wall of the shell.
The invention is further provided that opposite-type photoelectric sensors are symmetrically arranged at the bottoms of the two side walls of the shell, and the horizontal axis of each photoelectric sensor is positioned at the sector notch of the disk surface in the vertical direction of the turntable.
The invention is further provided that a contraction band is arranged between two adjacent middle frameworks, and the contraction band enables the two adjacent middle frameworks to be folded together.
A fast neutron screening method comprising the steps of:
Step one: an annular scintillator assembly is arranged in a sealed shell, the scintillator assembly can be folded and unfolded like a folding fan, the scintillator assembly can rotate around the center of the shell, a first motor is arranged in the shell and drives the scintillator assembly to rotate through a driving shaft, the scintillator assembly comprises a scintillator layer, a first framework, a middle framework, a second framework, an annular membrane, a blocking adsorption layer and a second motor, a breaking groove is formed in the membrane along the radial direction of the membrane, the first framework and the second framework are respectively connected with the end parts of the membranes at the two sides of the breaking groove, the middle framework is provided with a plurality of middle frameworks, the middle framework is positioned between the first framework and the second framework and is respectively connected with the membranes, the first framework is fixedly connected with the driving shaft, the middle framework and the second framework are in rotary connection with the driving shaft, the scintillator layer is arranged on the front surface of the membrane, the blocking adsorption layer is arranged on the back surface of the membrane, the second motor is fixedly arranged on the driving shaft, and the second motor can drive the second framework to rotate, so that the scintillator assembly is in an opening state and the scintillator assembly rotates at a uniform speed through the first motor;
Step two, a neutron generating source emits neutrons to an incidence surface of a scintillator layer in the shell, so that neutron beams of at least one period are emitted to the scintillator;
Step three, transmitting the luminous signals on the scintillator to a photomultiplier through an optical fiber, and then transmitting the signals to a microprocessor by the photomultiplier, wherein the microprocessor records the quantity and the intensity of the received signals;
Step four, the microprocessor processes the data information of the signal quantity and the intensity in unit time and finds out the regularized change in the data information, so as to obtain the pulse period of the neutron beam;
And fifthly, the microprocessor controls the first motor and the second motor to work according to the pulse period, the first motor is adjusted to a proper rotating speed to match with the unit pulse period time, and the second motor drives the second framework to rotate, so that the scintillator assembly is unfolded to a proper angle to block fast neutrons incident in unit time.
The invention has the beneficial effects that:
The fast neutron screening device and the fast neutron screening method provided by the invention can test the pulse period of the neutron beam, so that the fast neutron screening device and the fast neutron screening method for automatically adjusting and filtering fast neutrons are simple to use and efficient in work.
The working principle is as follows: the method comprises the steps that firstly, a scintillator assembly is fully unfolded to form a circular ring, a first motor drives the scintillator assembly to rotate at a constant speed, a neutron generation source emits neutron beams to the incident surface of the scintillator assembly, the neutron beams emitted in more than one period can be fully emitted to the scintillator assembly, the scintillator assembly can emit light, an electric signal is generated through a light detector and is sent to a microprocessor, fast neutrons can be different from other neutrons and have larger energy, a light detection element receiving the fast neutrons can emit stronger signals, the microprocessor receives the electric signals and stores and processes the electric signals, and the microprocessor calculates the pulse period of neutron beam according to the recorded electric signals with the strength and weakness of regular changes.
Assuming a pulse period of 3 seconds, wherein 2 seconds is the time for emitting fast neutrons, the time for one revolution of the scintillator assembly can be adjusted to 3 seconds, the microprocessor can achieve the aim of adjusting the rotation speed of the first motor, the angle for unfolding the scintillator assembly to 240 degrees, the fast neutrons emitted can be completely blocked by the scintillator assembly, and the adjustment can be achieved by controlling the second motor to drive the second framework to rotate through the microprocessor.
By adopting the technical scheme, fast neutrons in neutron beams emitted by the neutron source can be fully and automatically filtered and screened.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the structure of the present invention;
FIG. 3 is a schematic block diagram of the present invention;
FIG. 4 is a schematic diagram of the structure of a scintillator layer, a film, and a barrier adsorption layer of the present invention;
FIG. 5 is a schematic view of a scintillator assembly of the present invention in a collapsed state;
FIG. 6 is a schematic structural view of a first framework of the present invention;
FIG. 7 is a schematic view of the scintillator pack of the present invention in an expanded state.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is illustrated below with reference to fig. 1-7:
A fast neutron screening device includes a housing 1, a neutron generating source 2, a scintillator assembly 91, and a first motor 3.
The shell 1 is a closed shell 1, a neutron generating source 2 is arranged at the upper part of one side in the shell 1, and a neutron beam window 4 for emitting neutrons is arranged on the wall of the shell 1 corresponding to the neutron generating source 2. The neutron beam emitted by the neutron generating source is screened and then emitted from the neutron beam window 4.
The scintillator assembly is vertically arranged in the middle of the inside of the shell 1, the axle center of the scintillator assembly is positioned at the lower part of the horizontal axis of the neutron generating source 2, the neutron generating source 2 corresponds to the front position of the scintillator assembly, the first motor 3 is horizontally arranged at the other side of the inside of the shell 1, and the driving shaft of the first motor 3 is connected with the center of the scintillator assembly; the scintillator assembly is used for screening neutron beams to filter out fast neutrons.
The scintillator assembly is circular, and comprises a scintillator layer 5, a first framework 6, a middle framework 7, a second framework 8, a circular membrane 9, a blocking adsorption layer 10 and a second motor 11, wherein the scintillator assembly is of a structure similar to a folding fan used in life, can be unfolded and folded, and is in a complete circular shape after being unfolded.
The first framework 6, the middle framework 7 and the second framework 8 are long-strip-shaped and are similar to the framework of a folding fan in shape, and the first framework 6, the middle framework 7 and the second framework 8 are identical in shape and structure. One end of the first framework 6 is provided with a shaft hole which is connected with a driving shaft of the first motor, and the first framework 6, the middle framework 7 and the second framework 8 are sequentially arranged on the driving shaft of the first motor.
The membrane 9 is radially provided with a breaking groove 12, the first framework 6 and the second framework 8 are respectively connected with the end parts of the membrane 9 at the two sides of the breaking groove 12, a plurality of middle frameworks 7 are arranged, the middle frameworks 7 are positioned between the first framework 6 and the second framework 8 and are respectively connected with the membrane 9, the middle frameworks 7 are uniformly arranged after being unfolded, the first framework 6 is fixedly connected with a driving shaft, the middle frameworks 7 and the second framework 8 are rotationally connected with the driving shaft,
The scintillator layer 5 is arranged on the front surface of the film 9, the scintillator layer 5 emits light when irradiated by neutrons and emits an electric signal, the blocking adsorption layer 10 is arranged on the back surface of the film 9, and the blocking adsorption layer 10 absorbs and isolates neutron beams.
The second motor 11 is fixedly arranged on the driving shaft, and the second motor 11 can drive the second framework 8 to rotate; the driving shaft is connected with a shaft sleeve 61, the shaft sleeve 61 is in running fit with the driving shaft 63 through a bearing 62, the shaft sleeve 61 is fixedly connected with the second framework 8, a motor shaft of the second motor 11 is meshed and linked with the shaft sleeve 61 through a gear 64, and the scintillator assembly is unfolded and folded through the rotation of the driving shaft sleeve 61.
The photoelectric detector comprises a plurality of optical fibers 15 and a plurality of light detection elements 16, wherein the light detection elements 16 are photomultiplier tubes, the optical fibers 15 are arranged corresponding to the scintillator layer 5, the plurality of light detection elements 16 are arranged corresponding to the optical fibers 15, the light detection elements 16 are connected with the microprocessor 14, the microprocessor 14 can calculate pulse period information of neutron beam according to the received electric signals of the plurality of light detection elements 16, and the microprocessor 14 regulates and controls the rotating speed of the first motor 3 and the rotating angle of the second motor 11 for driving the second framework 8 to rotate according to the pulse period information.
And a touch display 17 coupled to the microprocessor 14.
Wherein, the upper part of the shell 1 is provided with a vacuumizing tube 18.
Wherein, the inner cavity wall of the shell 1 is provided with a boron carbide adsorption layer.
Wherein, the opposite-emission photoelectric sensor 19 is symmetrically arranged at the bottoms of the two side walls of the shell 1, and the horizontal axis of the photoelectric sensor 19 is positioned at the sector notch of the disk surface in the vertical direction of the turntable.
Wherein, a contraction band 20 is arranged between two adjacent middle frameworks 7, and the contraction band 20 enables the two adjacent middle frameworks 7 to be folded together. The contraction belt plays a role in restraining the middle framework, one end of the middle framework is connected with the driving shaft, the other end of the middle framework is connected through the contraction belt, and the length of the contraction belt is smaller than the distance between the other ends of the adjacent middle frameworks in the unfolding state.
A fast neutron screening method comprising the steps of:
step one: an annular scintillator assembly is arranged in a sealed shell 1, the scintillator assembly can be folded and opened like a folding fan, the scintillator assembly can rotate around the center of the scintillator assembly, a first motor 3 is arranged in the shell 1, the first motor 3 drives the scintillator assembly to rotate through a driving shaft, the scintillator assembly comprises a scintillator layer 5, a first framework 6, an intermediate framework 7, a second framework 8, an annular membrane 9, a blocking adsorption layer 10 and a second motor 11, a breaking groove 12 is formed in the membrane 9 along the radial direction of the membrane 9, the first framework 6 and the second framework 8 are respectively connected with the end parts of the membrane 9 at the two sides of the breaking groove 12, the intermediate framework 7 is provided with a plurality of the intermediate frameworks 7, the intermediate frameworks 6 and the second framework 8 are respectively connected with the membrane 9, the first framework 6 is fixedly connected with the driving shaft, the intermediate frameworks 7 and the second framework 8 are in rotary connection with the driving shaft, the scintillator layer 5 is arranged on the front surface of the membrane 9, the blocking adsorption layer 10 is arranged on the back surface of the membrane 9, the second motor 11 is fixedly arranged on the driving shaft, and the second motor 11 can drive the second framework 8 to rotate to enable the second framework 8 to be respectively connected with the end parts of the membrane 9, and the intermediate framework 7 is in a state of the first scintillator assembly to be driven to rotate at a constant speed through the first scintillator 3;
Step two, the neutron generating source 2 emits neutrons to the incidence surface of the scintillator layer 5 in the housing 1, so that the neutron beam of at least one period is emitted to the scintillator;
Step three, the luminous signals on the scintillator are transmitted to the photomultiplier through the optical fiber 15, the photomultiplier sends the signals to the microprocessor 14, and the microprocessor 14 records the quantity and intensity of the received signals;
step four, the microprocessor 14 processes the data information of the signal quantity and intensity in unit time and finds out the regularized change thereof, thereby obtaining the pulse period of the neutron beam;
Step five, the microprocessor 14 controls the first motor 3 and the second motor 11 to work according to the pulse period, the first motor 3 is adjusted to a proper rotating speed to match the unit pulse period time, and the second motor 11 drives the second framework 8 to rotate, so that the scintillator assembly is unfolded to a proper angle to block fast neutrons incident per unit time.
The invention has the beneficial effects that:
The fast neutron screening device and the fast neutron screening method provided by the invention can test the pulse period of the neutron beam, so that the fast neutron screening device and the fast neutron screening method for automatically adjusting and filtering fast neutrons are simple to use and efficient in work.
The working principle is as follows: the scintillator assembly is fully unfolded to form a circular ring, the first motor 3 drives the scintillator assembly to rotate at a constant speed, the neutron generating source 2 emits neutron beams to the incident surface of the scintillator assembly, the neutron beams emitted in more than one period can be fully emitted to the scintillator assembly, the scintillator assembly can emit light, an electric signal is generated through the light detector and is sent to the microprocessor 14, the fast neutrons can be different from other neutrons and have larger energy, the light detecting element 16 receiving the fast neutrons can emit stronger signals, the microprocessor 14 receives the electric signals and stores and processes the electric signals, and the microprocessor 14 calculates the pulse period of the neutron beam according to the recorded electric signals with the strength and weakness of the regular change.
Assuming a pulse period of 3 seconds, wherein 2 seconds is the time for emitting fast neutrons, the time for one revolution of the scintillator assembly can be adjusted to 3 seconds, and the microprocessor 14 can adjust the angle of the expansion of the scintillator assembly to 240 degrees by adjusting the rotation speed of the first motor 3, so that the fast neutrons emitted can be completely blocked by the scintillator assembly, and the adjustment is realized by controlling the second motor 11 to drive the second skeleton 8 to rotate through the microprocessor 14.
By adopting the technical scheme, fast neutrons in neutron beams emitted by the neutron source can be fully and automatically filtered and screened.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (7)
1. A fast neutron screening device, characterized in that: the neutron source is arranged at the upper part of one side in the shell, a neutron beam window is arranged on the wall of the shell corresponding to the side of the neutron source, the scintillator assembly is vertically arranged at the middle part in the shell, the axle center of the scintillator assembly is positioned at the lower part of the horizontal axis of the neutron source, the neutron source corresponds to the front position of the scintillator assembly, the first motor is horizontally arranged at the other side in the shell, and the driving shaft of the first motor is connected with the center of the scintillator assembly; the scintillator component is annular and comprises a scintillator layer, a first framework, a middle framework, a second framework, a circular membrane, a blocking adsorption layer and a second motor, wherein a breaking groove is formed in the membrane along the radial direction of the membrane, the first framework and the second framework are respectively connected with the end parts of the membrane at the two sides of the breaking groove, the middle framework is provided with a plurality of parts, the middle framework is positioned between the first framework and the second framework and is respectively connected with the membrane, the first framework is fixedly connected with a driving shaft, the middle framework and the second framework are rotatably connected with the driving shaft, the scintillator layer is arranged on the front surface of the membrane, the blocking adsorption layer is arranged on the back surface of the membrane, the second motor is fixedly arranged on the driving shaft, and the second motor can drive the second framework to rotate; the optical detector is provided with a plurality of optical fibers and a plurality of light detection elements, the optical fibers are arranged corresponding to the scintillator layer, the plurality of light detection elements are arranged corresponding to the optical fibers, the light detection elements are connected with the microprocessor, the microprocessor can calculate pulse period information of neutron beam current according to the received electric signals of the plurality of light detection elements, and the microprocessor regulates and controls the rotating speed of the first motor and the rotating angle of the second motor driven second framework according to the pulse period information.
2. The fast neutron screening device of claim 1, wherein: and a touch display connected with the microprocessor.
3. The fast neutron screening device of claim 1, wherein: the upper part of the shell is provided with a vacuumizing tube.
4. The fast neutron screening device of claim 1, wherein: the inner cavity wall of the shell is provided with a boron carbide adsorption layer.
5. The fast neutron screening device of claim 1, wherein: opposite-type photoelectric sensors are symmetrically arranged at the bottoms of the two side walls of the shell, and the horizontal axis of each photoelectric sensor is located at the position of a sector notch of the disk surface in the vertical direction of the turntable.
6. The fast neutron screening device of claim 1, wherein: a contraction band is arranged between two adjacent middle frameworks, and the contraction band enables the two adjacent middle frameworks to be folded together.
7. The fast neutron screening method is characterized by comprising the following steps of: step one: an annular scintillator assembly is arranged in a sealed shell, the scintillator assembly can be folded and unfolded like a folding fan, the scintillator assembly can rotate around the center of the shell, a first motor is arranged in the shell and drives the scintillator assembly to rotate through a driving shaft, the scintillator assembly comprises a scintillator layer, a first framework, a middle framework, a second framework, an annular membrane, a blocking adsorption layer and a second motor, a breaking groove is formed in the membrane along the radial direction of the membrane, the first framework and the second framework are respectively connected with the end parts of the membranes at the two sides of the breaking groove, the middle framework is provided with a plurality of middle frameworks, the middle framework is positioned between the first framework and the second framework and is respectively connected with the membranes, the first framework is fixedly connected with the driving shaft, the middle framework and the second framework are in rotary connection with the driving shaft, the scintillator layer is arranged on the front surface of the membrane, the blocking adsorption layer is arranged on the back surface of the membrane, the second motor is fixedly arranged on the driving shaft, and the second motor can drive the second framework to rotate, so that the scintillator assembly is in an opening state and the scintillator assembly rotates at a uniform speed through the first motor; step two, a neutron generating source emits neutrons to an incidence surface of a scintillator layer in the shell, so that neutron beams of at least one period are emitted to the scintillator; step three, transmitting the luminous signals on the scintillator to a photomultiplier through an optical fiber, and then transmitting the signals to a microprocessor by the photomultiplier, wherein the microprocessor records the quantity and the intensity of the received signals; step four, the microprocessor processes the data information of the signal quantity and the intensity in unit time and finds out the regularized change in the data information, so as to obtain the pulse period of the neutron beam; and fifthly, the microprocessor controls the first motor and the second motor to work according to the pulse period, the first motor is adjusted to a proper rotating speed to match with the unit pulse period time, and the second motor drives the second framework to rotate, so that the scintillator assembly is unfolded to a proper angle to block fast neutrons incident in unit time.
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| CN110136860A (en) | 2019-08-16 |
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