CN110673191B - Channel type radioactive source positioning system and method - Google Patents
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Abstract
The invention provides a channel type radioactive source positioning system and a method thereof, wherein the system comprises: the energy spectrometer is used for detecting the radioactive source to obtain a counting rate change curve of the radioactive source; the image acquisition module is used for acquiring a video image of a pedestrian channel; and the processing module is used for analyzing the video image to obtain the pedestrian flow average movement speed of the pedestrian passage and positioning the radioactive source according to the pedestrian flow average movement speed and the radioactive source counting rate change curve. The invention can quickly and accurately position the radioactive source, is suitable for a plurality of scenes such as airport customs exit, and has strong applicability and low cost.
Description
Technical Field
The invention relates to the technical field of nuclear radiation detection, in particular to a channel type radioactive source positioning system and a channel type radioactive source positioning method.
Background
Nuclear safety is an important component of national safety, and nuclear radiation monitoring can effectively guarantee the homeland safety and public safety.
At present, the channel type radioactivity monitoring system is widely applied to safety inspection of personnel, goods and the like, the traditional channel type radioactivity monitoring system enables the detection efficiency in a door to be highest through certain shielding, and meanwhile detected personnel sequentially pass through the system and lock suspects through alarming. This approach works for less radioactive sources, but when the source is stronger, an alarm can be generated at a location farther from the tunnel radioactivity monitoring system, at which time the wrong suspect is easily locked because of the longer distance. In this case, it is necessary to isolate all the persons on the passage and then measure them one by one, which is time and labor consuming and may cause more radiation injury to the persons. Therefore, if the radioactive source carrying personnel can be locked in advance, the problems can be effectively avoided.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
Therefore, one objective of the present invention is to provide a tunnel-type radioactive source positioning system, which can quickly and accurately position a radioactive source, is suitable for multiple scenes such as airport gate and the like, and has strong applicability and low cost.
The second purpose of the invention is to provide a method for positioning a tunnel-type radioactive source.
To achieve the above object, an embodiment of a first aspect of the present invention provides a system for positioning a channeled radiation source, including: the energy spectrometer is used for detecting the radioactive source to obtain a counting rate change curve of the radioactive source; the image acquisition module is used for acquiring a video image of a pedestrian channel; and the processing module is used for analyzing the video images to obtain the pedestrian flow average movement speed of the pedestrian passage and positioning the radioactive source according to the pedestrian flow average movement speed and the radioactive source counting rate change curve.
According to the channel type radioactive source positioning system provided by the embodiment of the invention, the energy spectrometer is used for obtaining the change curve of the counting rate of the radioactive source, the image acquisition module is used for obtaining the video image of the pedestrian channel, the processing module is used for analyzing the video image to obtain the average pedestrian flow movement speed of the pedestrian channel, and the radioactive source is positioned according to the average pedestrian flow movement speed and the change curve of the counting rate of the radioactive source, so that the radioactive source can be quickly and accurately positioned, the channel type radioactive source positioning system is suitable for multiple scenes such as airport customs and the like, and is high in applicability and low in cost.
In addition, the position system of the tunnel-type radioactive source according to the above embodiment of the present invention may further have the following additional technical features:
in some examples, further comprising: and the display module is used for displaying the positioning result of the radioactive source output by the processing module in real time.
In some examples, the spectrometer comprises: scintillation detectors and/or gas detectors for detecting gamma rays and/or neutrons.
In some examples, the processing module is configured to identify each moving object in the video image according to an optical flow method to calculate the average motion velocity of the human flow.
In some examples, the processing module is further to: according to data y (t0-n), y (t0-n-1), … and y (t0) in n seconds before the current time t0, fitting is carried out according to the following formula, and the current time t0 is obtained:
where A is proportional to the activity of the radioactive source and the intrinsic efficiency of the spectrometer, v is the speed of the pedestrian's movement, r0For the perpendicular distance of pedestrian and energy spectrometer, b is energy spectrometer background count rate, and t is the time, and when the pedestrian approached during the energy spectrometer, time t is the burden, when the pedestrian apart from during the energy spectrometer is nearest, time t is 0, when the pedestrian kept away from the energy spectrometer, time t is positive.
In some examples, the pedestrian passageway is one or more and the number of spectrometers is one or more.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides a method for positioning a channeled radiation source, including the following steps: detecting a radioactive source to obtain a change curve of the counting rate of the radioactive source; acquiring a video image of a pedestrian channel; and analyzing the video image to obtain the pedestrian flow average movement speed of the pedestrian passage, and positioning the radioactive source according to the pedestrian flow average movement speed and the radioactive source counting rate change curve.
According to the channel type radioactive source positioning method provided by the embodiment of the invention, the radioactive source is detected, the counting rate change curve of the radioactive source is obtained, the video image of the pedestrian channel is obtained, the video image is analyzed, the pedestrian flow average movement speed of the pedestrian channel is obtained, and the radioactive source is positioned according to the pedestrian flow average movement speed and the counting rate change curve of the radioactive source, so that the radioactive source can be quickly and accurately positioned, the channel type radioactive source positioning method is suitable for multiple scenes such as airport customs, and the like, and has strong applicability and low cost.
In addition, the positioning method of the tunnel type radioactive source according to the above embodiment of the present invention may further have the following additional technical features:
in some examples, further comprising: and displaying the positioning result of the radioactive source output by the processing module in real time.
In some examples, each moving object in the video image is identified according to an optical flow method to calculate the people flow average movement velocity.
In some examples, further comprising: according to data y (t0-n), y (t0-n-1), … and y (t0) in n seconds before the current time t0, fitting is carried out according to the following formula, and the current time t0 is obtained:
where A is proportional to the activity of the radioactive source and the intrinsic efficiency of the spectrometer, v is the speed of the pedestrian's movement, r0For the perpendicular distance of pedestrian and energy spectrometer, b is energy spectrometer background count rate, and t is the time, and when the pedestrian approached during the energy spectrometer, time t is the burden, when the pedestrian apart from during the energy spectrometer is nearest, time t is 0, when the pedestrian kept away from the energy spectrometer, time t is positive.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a system for positioning a channeled radiation source according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of an application scenario of a channeled radiation source positioning system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an application scenario of a channeled radiation source positioning system according to another embodiment of the present invention;
FIG. 4 is a diagram illustrating an exemplary count rate curve obtained from a simulation according to one embodiment of the present invention;
FIG. 5 is a flow chart of a method for positioning a channeled radiation source according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following describes a system and a method for positioning a channeled radioactive source according to embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a block diagram of a system for positioning a channeled radiation source according to one embodiment of the present invention. As shown in FIG. 1, the channeled radiation source positioning system 100 includes: an energy spectrometer 110, an image acquisition module 120, and a processing module 130.
The energy spectrometer 110 is used for detecting the radioactive source to obtain a counting rate change curve of the radioactive source.
Specifically, the spectrometer 110 includes: scintillation detectors and/or gas detectors for detecting gamma rays and/or neutrons. That is, the spectrometer 110 is, for example, a gamma/neutron spectrometer.
And the image acquisition module 120 is used for acquiring a video image of the pedestrian passage. Specifically, the image capturing module 120 is, for example, a monitoring camera. The pedestrian passage can be isolated and planned by a warning line, namely, a pedestrian movement route is preset by the warning line, so that the pedestrian passage is formed.
And the processing module 130 is configured to analyze the video image to obtain a pedestrian flow average movement speed of the pedestrian passageway, and perform radioactive source positioning according to the pedestrian flow average movement speed and the radioactive source count rate change curve. Specifically, the processing module 130 is, for example, a background information processing center, the information processing center reads and processes signals of the energy spectrometer and the monitoring camera, the monitoring camera analyzes video images to calculate average movement velocity of the people flow, and a change curve of the counting rate of the radiation source measured by the energy spectrometer is combined with the change curve of the counting rate of the radiation source to realize positioning of the radiation source.
Specifically, the processing module 130 is configured to identify each moving object in the video image according to an optical flow method to calculate the average movement velocity of the people flow.
In one embodiment of the present invention, the system 100 further comprises a display module (not shown). And the display module is used for displaying the positioning result of the radioactive source output by the processing module 130 in real time, so that a worker can conveniently check the positioning result in real time and accurately learn the position of the radioactive source.
In a specific embodiment, the channel-type radioactive source positioning system can be composed of a gamma/neutron spectrometer, a monitoring camera and an information processing center. A pedestrian passing orbit (namely a pedestrian passage) is set by a passage warning line in advance, the average movement speed of the pedestrian flow is analyzed and calculated by a video image of a monitoring camera, then a change curve of the counting rate of a radioactive source measured by a gamma/neutron spectrometer is combined to realize the positioning of the radioactive source, and the positioning result is displayed on a monitoring video in real time, so that the radioactive source can be positioned quickly and accurately.
In one embodiment of the present invention, the processing module 130 is further configured to: according to data y (t0-n), y (t0-n-1), … and y (t0) in n seconds before the current time t0, fitting is carried out according to the following formula, and the current time t0 is obtained:
where A is proportional to the activity of the radioactive source and the intrinsic efficiency of the spectrometer 110, v is the speed of the pedestrian's motion, r0Is the vertical distance between the pedestrian and the spectrometer 110, b is the background count rate of the spectrometer 110, t is time, when the pedestrian approaches the spectrometer 110, time t is negative, when the pedestrian is closest to the spectrometer 110, time t is 0, when the pedestrian is far away from the spectrometer 110, time t is positive.
In one embodiment of the invention, the pedestrian passageways are one or more and the spectrometer 110 is one or more in number. As a specific example, for example, as shown in fig. 2, a case where there is one pedestrian passage and one spectrometer 110 is illustrated. For example, as shown in FIG. 3, a pedestrian lane of three and an energy spectrometer 110 of two are shown.
In a specific embodiment, when there is one pedestrian passageway and one spectrometer 110, assuming that the pedestrian passageway is a straight line, the people in the passageway move at a uniform speed, and the count received by the spectrometer 110 is inversely proportional to the square of the distance, and there is no human blocking. Then: the count rate formula on the spectrometer 110 is as follows:
where A is proportional to the activity of the radioactive source and the intrinsic efficiency of the spectrometer 110, v is the speed of the human motion, r0B (t) is the background count rate of the spectrometer 110, t is the time, and the time is negative when the person approaches the spectrometer 110, 0 when the person is closest to the spectrometer 110, and positive when the person is away from the spectrometer 110.
A typical simulated count rate curve is shown in fig. 4. From the curve shown in fig. 4, the position of the radiation source, i.e. the suspect, can be determined according to the characteristics of the fixed point, and the position of the radiation source, i.e. the suspect, can also be estimated according to the counting rate curve characteristics when the radiation source reaches the vertex.
In the case of a person with a known speed of movement: when v is 0.5m/s, A is 35000, n is 30, k is 10, r0The simulated curve is greater than background +30 times Sigma at time t-7, fitting result t-7.07, r0＝0.1。
When v is 0.5m/s, A is 35000, n is 6, k is 10, r0At 0.5, the simulated curve is greater than background +6 times Sigma at time t-16, the fit is at-16.8, r0＝0.1。
When v is 0.5m/s, A is 350, n is 6, k is 10, r0The simulated curve is greater than background +6 times Sigma at time t-1, and the fit result t-1.6867, r0＝0.8216。
That is, the radiation source position may be obtained by model fitting before the radiation source reaches the nearest position. Fitting result r0Inaccuracy is due to the fact that the parameter is much less than the suspect and the spectrometer 110 distance and therefore has little effect on the result, it is practical to give an empirical value for the parameter.
In the case of unknown speed of movement of the person: due to r0Small, has little effect on the curve, especially for a suspect at a distance from the spectrometer 110, and therefore the model
Can be simplified into
In the case where a and v are unknown, fitting does not yield accurate results for the following reasons: for example, if a suspect a is 1000 and v is 1, the curve is
And another suspect, a 4000, v 2, is also plotted
Yet another suspect, a 9000, v 3, has a curve
The actual a and v cannot be fit, and although the fit result can be estimated a few seconds later for the suspect to walk to the side of the spectrometer 110, the distance cannot be known without the velocity.
Therefore, it is necessary to know the speed at which the person is walking and to accurately estimate the position. In general, in places where security inspection is set, such as airports and the like, people are not fast in walking speed and generally cannot be blocked. The speed can be analyzed by video images of a1, or by infrared sensors to measure the person passing rate, or by giving an empirical value.
In a particular embodiment, when there are three pedestrian lanes and two spectrometer 110, the counts of the two spectrometer 110 can be fit together, more accurately. But it needs to be decided which of the three channels is, so for r0The accuracy requirement of the fitting result is high. The single spectrometer 110 pair r0Is less accurate, but if there are two spectrometers 110, r can be better estimated by the count rate between the two spectrometers 1100。
The following are simulation scenarios for two spectrometers 110: assume that on channel 1 (channel 3 is the opposite), a 35000 and v 0.5, the vertical distance r from a spectrometer10.5, perpendicular distance r from the other spectrometer21.5. The 10sigma trigger t is-13, and the fitting result is t-13.2, r1＝2,r20.1, i.e. far and near the source where it is further from the spectrometerThe fitting is more accurate, but r1And r2The fitting result is not accurate.
Suppose that on channel 1, a is 35000 and v is 0.5, the vertical distance r from one spectrometer10.5, perpendicular distance r from the other spectrometer21.5. The result of the fitting is that t is-4.2, r1＝0.1,r21.4, i.e. the distance of the source and r, where the source is closer to the spectrometer1And r2The fitting results are accurate.
Suppose that on channel 1, a equals 350 (weak source) and v equals 0.5, the vertical distance r from one spectrometer10.5, perpendicular distance r from the other spectrometer21.5. The 10sigma trigger t is-0, and the fitting result is that t is-1.6, r1＝0.1,r 22. In the case of weak radioactive sources, the fitting can be triggered only at a position close to the spectrometer, the distance of the radioactive source and r1And r2The fitting result has certain error, but the channel can be accurately judged.
According to the channel type radioactive source positioning system provided by the embodiment of the invention, the energy spectrometer is used for obtaining the change curve of the counting rate of the radioactive source, the image acquisition module is used for obtaining the video image of the pedestrian channel, the processing module is used for analyzing the video image to obtain the average pedestrian flow movement speed of the pedestrian channel, and the radioactive source is positioned according to the average pedestrian flow movement speed and the change curve of the counting rate of the radioactive source, so that the radioactive source can be quickly and accurately positioned, the channel type radioactive source positioning system is suitable for multiple scenes such as airport customs and the like, and is high in applicability and low in cost.
A further embodiment of the present invention provides a method for positioning a channeled radioactive source.
FIG. 5 is a flow chart of a method for positioning a channeled radiation source according to one embodiment of the present invention. As shown in fig. 5, the method for positioning a tunnel-type radioactive source includes the following steps:
step S1: and detecting the radioactive source to obtain a change curve of the counting rate of the radioactive source. Specifically, the radioactive source can be detected by the energy spectrometer, and a counting rate change curve of the radioactive source is obtained. Energy spectrometers include, for example: scintillation detectors and/or gas detectors for detecting gamma rays and/or neutrons. That is, the spectrometer is, for example, a gamma/neutron spectrometer.
Step S2: and acquiring a video image of the pedestrian passage. Specifically, for example, a video image of a pedestrian passage is acquired by a monitoring camera. The pedestrian passage can be isolated and planned by a warning line, namely, a pedestrian movement route is preset by the warning line, so that the pedestrian passage is formed.
Step S3: and analyzing the video image to obtain the pedestrian flow average movement speed of the pedestrian passage, and positioning the radioactive source according to the pedestrian flow average movement speed and the change curve of the radioactive source counting rate. Specifically, for example, the information processing center reads and processes signals of the energy spectrometer and the monitoring camera, the monitoring camera analyzes video images to calculate the average movement speed of the people flow, and the energy spectrometer measures a change curve of the counting rate of the radioactive source, and the two are combined to realize the positioning of the radioactive source.
Specifically, in step S3, each moving object in the video image may be identified according to the optical flow method to calculate the average moving speed of the human flow.
In one embodiment of the invention, the method further comprises: the radioactive source output by the real-time display processing module can position the result, so that workers can conveniently check the result in real time and accurately learn the position of the radioactive source.
In one embodiment of the invention, the method further comprises: according to data y (t0-n), y (t0-n-1), … and y (t0) in n seconds before the current time t0, fitting is carried out according to the following formula, and the current time t0 is obtained:
where A is proportional to the activity of the radioactive source and the intrinsic efficiency of the spectrometer, v is the speed of the pedestrian's movement, r0For the perpendicular distance of pedestrian and energy spectrometer, b is energy spectrometer background count rate, and t is the time, and when the pedestrian walked near the energy spectrometer, time t was the burden, and when the pedestrian was nearest apart from the energy spectrometer, time t was 0, and when the pedestrian kept away from the energy spectrometer, time t was positive.
In one embodiment of the invention, the number of pedestrian passageways is one or more and the number of spectrometers is one or more.
It should be noted that a specific implementation manner of the positioning method for a tunnel-type radioactive source in the embodiment of the present invention is similar to a specific implementation manner of the positioning system for a tunnel-type radioactive source in the embodiment of the present invention, and please refer to the description of the system part specifically, and details are not described here again in order to reduce redundancy.
According to the channel type radioactive source positioning method provided by the embodiment of the invention, the radioactive source is detected, the counting rate change curve of the radioactive source is obtained, the video image of the pedestrian channel is obtained, the video image is analyzed, the pedestrian flow average movement speed of the pedestrian channel is obtained, and the radioactive source is positioned according to the pedestrian flow average movement speed and the counting rate change curve of the radioactive source, so that the radioactive source can be quickly and accurately positioned, the channel type radioactive source positioning method is suitable for multiple scenes such as airport customs, and the like, and has strong applicability and low cost.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A channeled radiation source positioning system, comprising:
the energy spectrometer is used for detecting the radioactive source to obtain a counting rate change curve of the radioactive source;
the image acquisition module is used for acquiring a video image of a pedestrian channel;
the processing module is used for analyzing the video image to obtain the pedestrian flow average movement speed of a pedestrian passage and positioning the radioactive source according to the pedestrian flow average movement speed and the radioactive source counting rate change curve;
the processing module is further configured to: according to data y (t0-n), y (t0-n-1), … and y (t0) in n seconds before the current time t0, fitting is carried out according to the following formula, and the current time t0 is obtained:
where A is proportional to the activity of the radioactive source and the intrinsic efficiency of the spectrometer, v is the speed of the pedestrian's movement, r0The method comprises the following steps of taking the vertical distance between a pedestrian and an energy spectrometer, taking b as the background counting rate of the energy spectrometer, taking t as time, taking the pedestrian close to the energy spectrometer, wherein the time t is negative, taking the pedestrian to be closest to the energy spectrometer, the time t is 0, taking the pedestrian to be far away from the energy spectrometer, the time t is positive, y (t) is the counting rate estimated according to the formula at the moment t, y (t0) is the actual measured counting rate at the current time t0, y (t0-n-1) is the actual measured counting rate at the current time t0 in n-1 seconds before, and y (t0-n) is the actual measured counting rate at the current time t0 in n seconds before.
2. The channeled radiation source positioning system of claim 1, further comprising:
and the display module is used for displaying the positioning result of the radioactive source output by the processing module in real time.
3. The channeled radiation source positioning system of claim 1, wherein the energy spectrometer comprises: scintillation detectors and/or gas detectors for detecting gamma rays and/or neutrons.
4. The system of claim 1, wherein the processing module is configured to identify moving objects in the video images according to an optical flow method to calculate the average speed of motion.
5. The channeled radiation source positioning system of claim 1 wherein the pedestrian channels are one or more and the number of spectrometers is one or more.
6. A method for positioning a tunnel-type radioactive source is characterized by comprising the following steps:
detecting a radioactive source to obtain a change curve of the counting rate of the radioactive source;
acquiring a video image of a pedestrian channel;
the processing module analyzes the video image to obtain the average pedestrian flow movement speed of a pedestrian passage, and positions the radioactive source according to the average pedestrian flow movement speed and the change curve of the radioactive source counting rate;
the method for positioning the channel type radioactive source further comprises the following steps:
the processing module further performs fitting according to the data y (t0-n), y (t0-n-1), … and y (t0) in n seconds before the current time t0 according to the following formula to obtain a current time t 0:
where A is proportional to the activity of the radioactive source and the intrinsic efficiency of the spectrometer, v is the speed of the pedestrian's movement, r0For the perpendicular distance of pedestrian and energy spectrometer, b is the energy spectrometer background count rate, and t is the time, when the pedestrian approaches the energy spectrometer, time t is the negativity, when the pedestrian is apart from the energy spectrometer when being nearest, time t is 0, when the pedestrian is kept away from the energy spectrometer, time t is positive, y (t) is the count rate that the moment t was estimated according to above-mentioned formula, y (t0) is the actual measured count rate of present time t0, y (t0-n-1) is the actual measured count rate in the preceding n-1 seconds of present time t0, and y (t0-n) is present time t0 and preceding n-1 secondsThe actually measured count rate in n seconds.
7. The method of claim 6, further comprising:
and displaying the positioning result of the radioactive source output by the processing module in real time.
8. The method of claim 6, wherein the moving objects in the video image are identified according to an optical flow method to calculate the average moving velocity of the human stream.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055994A (en) * | 1991-04-25 | 1991-11-06 | 清华大学 | The conveyer-belt nucleon weigher of low-radiation high-stability |
| WO1995014245A1 (en) * | 1993-11-19 | 1995-05-26 | Ail Systems, Inc. | Gamma ray imaging system |
| CN102156880A (en) * | 2011-04-11 | 2011-08-17 | 上海交通大学 | Method for detecting abnormal crowd behavior based on improved social force model |
| CN104570044A (en) * | 2014-12-10 | 2015-04-29 | 北京永新医疗设备有限公司 | Real-time detecting system and method for radioactive materials carried by personnel |
| CN107643547A (en) * | 2016-07-21 | 2018-01-30 | 环境保护部核与辐射安全中心 | The current vehicle radioactive substance monitoring system in traffic main artery |
| CN108717199A (en) * | 2018-06-19 | 2018-10-30 | 清华大学 | Radioactive substance image supervisory control device and method based on multi-detector |
| CN109738936A (en) * | 2019-02-11 | 2019-05-10 | 北京华力兴科技发展有限责任公司 | Substance detecting method, apparatus and system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10024985B1 (en) * | 2017-05-02 | 2018-07-17 | David Edward Newman | Gamma ray detector with two-dimensional directionality |
| CN108415061B (en) * | 2017-12-25 | 2020-03-31 | 北京永新医疗设备有限公司 | 4 pi space panoramic radioactive source positioning system and method |
-
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- 2019-09-23 CN CN201910899838.1A patent/CN110673191B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055994A (en) * | 1991-04-25 | 1991-11-06 | 清华大学 | The conveyer-belt nucleon weigher of low-radiation high-stability |
| WO1995014245A1 (en) * | 1993-11-19 | 1995-05-26 | Ail Systems, Inc. | Gamma ray imaging system |
| CN102156880A (en) * | 2011-04-11 | 2011-08-17 | 上海交通大学 | Method for detecting abnormal crowd behavior based on improved social force model |
| CN104570044A (en) * | 2014-12-10 | 2015-04-29 | 北京永新医疗设备有限公司 | Real-time detecting system and method for radioactive materials carried by personnel |
| CN107643547A (en) * | 2016-07-21 | 2018-01-30 | 环境保护部核与辐射安全中心 | The current vehicle radioactive substance monitoring system in traffic main artery |
| CN108717199A (en) * | 2018-06-19 | 2018-10-30 | 清华大学 | Radioactive substance image supervisory control device and method based on multi-detector |
| CN109738936A (en) * | 2019-02-11 | 2019-05-10 | 北京华力兴科技发展有限责任公司 | Substance detecting method, apparatus and system |
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