CN110471097A - Wide-range region γ radiation detector and detection method for complicated radiation environment - Google Patents
Wide-range region γ radiation detector and detection method for complicated radiation environment Download PDFInfo
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- CN110471097A CN110471097A CN201910911657.6A CN201910911657A CN110471097A CN 110471097 A CN110471097 A CN 110471097A CN 201910911657 A CN201910911657 A CN 201910911657A CN 110471097 A CN110471097 A CN 110471097A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/02—Dosimeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/167—Measuring radioactive content of objects, e.g. contamination
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Abstract
The invention discloses the wide-range region γ radiation detector and detection method for complicated radiation environment, detector includes showing treatment box and γ radiation detection probe on the spot, and the two is connected by the communications cable；Show that treatment box includes the first controller, AC power source breaker, filter, power module, DC power supply breaker and communication interface on the spot；The communications cable is for showing treatment box and γ radiation detection probe information exchange on the spot and providing DC power supply for γ radiation detection probe；γ radiation detection probe includes second controller, power supply processing circuit, communication interface, high-voltage control circuit, signal processing circuit, middle lower range GM counting tube detector and high range GM counting tube detector.The present invention is used for region γ radiation pollution under complicated radiation environment and monitors, and measuring range range extends to 9 orders of magnitude, and constant error is reduced within ± 15%.
Description
Technical field
The present invention relates to radiometric technique fields, and in particular to a kind of wide-range region γ for complicated radiation environment
Radiation detector and detection method.
Background technique
Nuclear power is in widespread attention as a kind of important clean energy resource, and many places have been set up more perfect people
Work radiation protection net, wherein γ radiation dose rate is an important monitoring parameters of nuclear radiation environment monitoring, especially in nuclear accident
Under case of emergency, the distribution situation for grasping radiation dose rate is conducive to promptly and accurately evaluate the radiation level around nuclear facilities, benefit
In specified accurately and effectively action strategy.
GM is mostly used to count greatly for monitoring the detector probe of γ radiation pollution in regional scope currently, relating in nuclear site
Pipe detector, GM counting tube detector has the advantages that at low cost, stability is good, output pulse amplitude is big, but also has simultaneously
The shortcomings that range ability is small and poor linearity, under the complex environment of some radiation environments, these equipment are had been unable to meet
The good requirement of the wide-range and the linearity that user proposes.
Summary of the invention
The technical problems to be solved by the present invention are: there are range ability is small and the linearity for conventional GM counting tube detector
The disadvantage of difference, the present invention provides solve the above problems for complicated radiation environment wide-range region γ radiation detector and
Detection method.
The present invention is achieved through the following technical solutions:
The present invention provides a kind of wide-range region γ radiation detector for complicated radiation environment, including shows place on the spot
Case and γ radiation detection probe are managed, it is described to show that treatment box is connected with γ radiation detection probe by the communications cable on the spot, it is described
Show on the spot treatment box include the first controller, AC power source breaker, filter, power module, DC power supply breaker and
Communication interface；First controller is connect with each communication interface, sends detection relevant control for popping one's head in γ radiation detection
Instruction and the detection information for collecting and handling the probe transmission of γ radiation detection；The AC power source breaker is outer for controlling
Portion's AC power source input wide-range region γ radiation detector for complicated radiation environment；The external ac power source of input
It is successively converted into DC power supply after filter and power module, and is delivered to the first controller and DC power supply breaker；
The DC power supply breaker and communication interface for showing treatment box on the spot are popped one's head in by the communications cable and γ radiation detection
Connection；The communications cable is for showing treatment box and γ radiation detection probe information exchange on the spot and popping one's head in for γ radiation detection
DC power supply is provided；
γ radiation detection probe include second controller, power supply processing circuit, communication interface, high-voltage control circuit,
Signal processing circuit, middle lower range GM counting tube detector and high range GM counting tube detector；The power supply processing circuit will
Show that the DC power supply that treatment box transmits is converted and filtered on the spot, supply second controller, high-voltage control circuit and signal
Processing circuit uses；The communication interface is used for connection communication cable and second controller；The high-voltage control circuit is for producing
Lower range GM counting tube detector and high range GM counting tube detector use in raw high voltage power supply supply；The signal processing electricity
The current impulse that middle lower range GM counting tube detector or high range GM counting tube detector generate is converted to voltage signal by road,
After being amplified to suitable amplitude by amplifier again, pulse signal is converted to by comparator, second controller is sent to and carries out at data
Reason；The second controller is used to count high-voltage control circuit and middle lower range GM counting tube detector and high range GM
The high pressure on-off of pipe detector is controlled.
Further, including at least two γ radiation detections are popped one's head in, and the quantity of the communications cable and γ radiation detection are popped one's head in
Unanimously；Each DC power supply breaker and each communication interface are connected by the same group of communications cable and a γ radiation detection probe
It connects.
Further, the second controller controls high-voltage control circuit using Time-to-Count technology, makes
Middle lower range GM counting tube detector or high range GM counting tube detector are in the recurrent state of " detection-suspend mode ".
Further, the measuring range of the middle lower range GM counting tube detector is 0.05 Gy/h~2.0 × 10 μ4μ
Gy/h, 100 Gy/h~1.0 × 10 μ of measuring range of the high range GM counting tube detector7μGy/h.Pass through second controller
The high pressure on-off of centering lower range GM counting tube detector and high range GM counting tube detector is controlled, to realize range
Switching.
Further, the external input AC power source is 220V AC power source, the high-voltage control circuit output voltage
Range is 200V~1250V.The present invention is improved by combining internal PID regulation technology and external feedback regulation technology
The rapidity and accuracy of reference voltage and final high voltage adjusting, it is ensured that load voltage is stablized, by the control precision improvement of voltage
To 0.3%.
Further, described to show that treatment box further includes display and key on the spot；Shown display is used as and shows on the spot
The display output equipment for the treatment of box, for showing working condition and the current count of γ radiation detection probe and related being arranged
Information；Standard input device of the key as the first controller, completes the setting of various parameters.
Further, described to show that treatment box further includes buzzer and alarm lamp on the spot；The buzzer and alarm
Indicator light provides sound-light alarm under the first monitoring control devices to pollution condition.
Based on the detection method of the above-mentioned wide-range region γ radiation detector for complicated radiation environment, including it is as follows
Step:
Step 1, show that treatment box is sent out the detection instruction of inquiry γ radiation detection probe on the spot, if detecting γ spoke
Detection probe is penetrated, step 2 is transferred to；
Step 2, show that treatment box sends the parameter configuration instruction of γ radiation detection probe on the spot, the parameter includes alarm
Threshold value, detector correction factor；The configuration successful if γ radiation detection is popped one's head in, the configured successful instruction of transmission is back to be shown on the spot
Show treatment box, is transferred to step 3；
Step 3, in first measurement, lower range GM counting tube detector is detected γ radiation detection probe in use, is led to
The high pressure for crossing measurement therefrom lower range GM counting tube detector establishes to first pulse the time generated and the meter measured
Numerical value to estimate the radiation intensity in surveyed place, and sets flag bit according to estimation results, and flag bit is arranged successfully, is transferred to step
Rapid 4；
Step 4, second controller is visited according to flag bit centering lower range GM counting tube detector and high range GM counting tube
The high-tension circuit for surveying device carries out on-off control, to be measured using suitable detector, if γ radiation detection probe is to spy
It surveys device control on-off success and detector measurement counts in the preset judgement range of second controller, be transferred to step 5；
Step 5, γ radiation detection probe sends detection data to showing that treatment box is shown on the spot.
The present invention has the advantage that and the utility model has the advantages that
The present invention realize under complicated radiation environment region γ radiation pollution monitor while, solve the type instrument
The problem of instrument range range is small, poor linearity, the measuring range range of detector provided by the invention extends to 9 orders of magnitude
(0.05 Gy/h~1.0 × 10 μ7μ Gy/h), constant error is reduced within ± 15%.
The Time-to-count technology and double GM pipe wide-range designs that γ radiation detection probe in the present invention uses, all
It is required that accurately being controlled load voltage.Currently, since existing detector circuit reference voltage adjusts Stability and veracity
Deficiency, there are deviations for voltage needed for causing each step voltage and GM counting tube detector, influence the linearity of detector.The present invention is logical
The connected applications for crossing internal PID regulation technology and external feedback regulation technology, improve high pressure stability and control it is accurate
Property, it is ensured that load voltage is stablized, and the control precision improvement of voltage to 0.3% is being measured to optimize GM counting tube detector
The linearity within the scope of journey.
Treatment in situ show case configures multiple γ radiation detection probes in the present invention, can be in certain regional scope, example
It, can be through the invention when contamination accident occurs if the different key positions in nuclear waste disposal workshop set up multiple monitoring nodes
The design of double GM pipe wide-ranges, treatment in situ show case shows the detection data of different probes and carries out sound-light alarm, administrator
Member can judge contamination accident point rapidly according to the data of different monitoring nodes, save time, while treatment in situ for accident treatment
Show case configurable remote network communication interface realizes system centralized management.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is structural block diagram of the present invention for the wide-range region γ radiation detector of complicated radiation environment；
Fig. 2 is process of the present invention for the detection method of the wide-range region γ radiation detector of complicated radiation environment
Figure.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1
A kind of wide-range region γ radiation detector for complicated radiation environment is present embodiments provided, including is shown on the spot
Show that treatment box, γ radiation detection probe and the communications cable are total to three parts, wherein show that treatment box can at most connect 4 simultaneously on the spot
A γ radiation detection probe.Specific structure is as follows:
(1) show that treatment box is disconnected including first controller, an AC power source breaker, four DC power supplies on the spot
Road device, a display screen, a set of key, four RS485 communication interfaces, a buzzer, an alarm lamp, a power supply
Module and a filter.
First controller selects the industrial control mainboard ESM6802 of Ying Chuan Information Technology Co., Ltd, it uses NXP i.MX6DL
ARM Cortex-A9 dual core processor, 800MHz CPU frequency, 4 DDR3 1GB Installed System Memories, eMMC 4GB high speed storing
Device, support USB flash disk plug and play, separate hardware real-time clock (RTC), power down time protection, hardware watchdog (WDT), prevent be
System deadlock.AC power source breaker is using the iC65N-C2A/2P of Schneider company for controlling external ac power source
On-off.DC power supply breaker is using the C65L-DC-C6A/2P of Schneider company for controlling probe direct current
The on-off in source.RS485 communication interface is completed to show treatment box and γ radiation detection probe information exchange function on the spot, in this example
Select the SN65LBC184D of Texas Instruments company as RS485 protocol interface, Analog Devices company
ADuM1201 is built as digital isolator.External input alternating current 220V power conversion is straight by filter and power module
Stream+12V power supply is used for the components such as the first controller on the spot and γ radiation detection probe.
(2) each γ radiation detection is popped one's head in including at a second controller, a RS485 communication interface, a power supply
Manage circuit, a signal processing circuit, a high-voltage control circuit, a middle lower range GM counting tube detector and an a large amount
Journey GM counting tube detector.
Second controller selects the MSP430F5659 of Texas Instruments company, using 16 buses, peripheral hardware
With memory unified addressing, addressing range can have unified interrupt management with external expansion memory, have abundant up to 64K
On piece peripheral module can support that single-chip microcontroller is debugged and downloaded online, can work under super low-power consumption mode.
RS485 communication interface is identical as the RS485 communication interface shown in treatment box on the spot, and the two is connected by the communications cable.Power supply
Processing circuit by show on the spot treatment box supply+12V DC power supply is converted to+3.3V and ± 5V linear power supply, voltage-controlled for height
The components such as circuit and second controller processed use.Signal processing circuit counts middle lower range GM counting tube detector and high range GM
The current impulse that number pipe detectors generate is converted to voltage signal, then after being amplified to suitable amplitude by amplifier, by comparator
Pulse signal is converted to, second controller is sent to and carries out data processing.High-voltage control circuit is used to generate GM counting tube detector
Required high voltage power supply selects the CC228-01P of Beijing Bin Song photoelectric technology limited liability company to take as core in this example
It builds, output voltage range is 200V~1250V, and good linearity, the operation is stable, second controller is using Time-to-Count technology
The enable end of CC228-01P is controlled.Middle lower range GM counting tube detector or high range GM counting tube detector difference
Selection measuring range range is 0.05 Gy/h~2.0 × 10 μ4μ Gy/h and 100 Gy/h~1.0 × 10 μ7The GM detector of μ Gy/h,
Second controller is controlled by the high pressure on-off to GM counting tube detector, to realize the switching of range.
The communications cable be used to transmit show on the spot treatment box provide γ radiation detection pop one's head in+12V DC power supply, Yi Jiyong
In the communication for showing that treatment box and γ radiation detection are popped one's head between the two on the spot.Each DC power supply breaker and each communication connect
Mouth passes through the same group of communications cable and a γ radiation detection probe connects.Application of the present invention is to use radionuclide
Workplace, therefore select 4 core of K3 rank Flouride-resistani acid phesphatase twisted-pair shielded wire cable two-by-two.
Embodiment 2
A kind of double GM counting tube detector wide-range designs are provided in the present embodiment, γ radiation detection probe is surveyed for the first time
Lower range GM counting tube detector is detected in use when amount, is established from the high pressure of GM pipe to first pulse and is produced by measurement
Raw time, and the count value measured, to estimate the radiation intensity in surveyed place, second controller passes through handle and is connected on GM
Triode at counting tube detector cathode completes the selection of detector as switching tube to control the high pressure on-off of detector,
In subsequent measurement process, if work detector measurement to measurement count be more than the preset decision content of second controller
When, second controller controls the high pressure on-off of detector again, to realize the switching of range.
The Time-to-count technology and double GM pipe wide-range designs that γ radiation detection probe in the present embodiment uses,
It requires and load voltage is accurately controlled.Currently, since existing detector circuit reference voltage adjusts accuracy and stabilization
Property it is insufficient, there are deviations for voltage needed for causing each step voltage and GM counting tube detector, influence the linearity of detector.This implementation
Example is provided with 3 kinds of internal feedback electricity such as resistive feedback circuit, Derivative Feedback circuit, integral feedback circuit in high-voltage control circuit
The feed circuit that road and CC228-01P high-pressure modular carry combines, and passes through the different response speed of each voltage regulator circuit, adjusts
The mutual cooperation of accuracy improves the stability of high pressure and the accuracy of control, it is ensured that load voltage is stablized, by the control of voltage
Precision improvement processed is to 0.3%, to optimize the linearity of the GM counting tube detector in range ability.
For a kind of detection side for wide-range region γ radiation detector for complicated radiation environment that embodiment 1 provides
Method is as follows:
It step 1, is initial actuating.
Step 2, show that treatment box is passed through the initialization of 220V AC power source and self-test, self-test are successfully transferred to step 4 on the spot；Instead
It, is transferred to step 3.
Step 3, malfunction setting, and terminate to run.
Step 4, RS485 communication module is opened.
Step 5, show that treatment box is sent out the detection instruction of inquiry γ radiation detection probe on the spot, if detecting γ spoke
Detection probe is penetrated, step 6 is transferred to, conversely, return step 4.
Step 6, show that treatment box sends the parameter configuration instruction of γ radiation detection probe on the spot, parameter includes level-one, two
Grade alarm threshold value, detector correction factor etc..The configuration successful if γ radiation detection is popped one's head in sends configured successful instruction and returns
To treatment box is shown on the spot, it is transferred to step 7；Conversely, being transferred to step 4.
Step 7, in first measurement, lower range GM counting tube detector is detected γ radiation detection probe in use, is led to
It crosses and measures the time that the high pressure foundation of therefrom lower range GM counting tube detector is generated to first pulse, and the meter measured
Numerical value to estimate the radiation intensity in surveyed place, and sets flag bit according to estimation results, and flag bit is arranged successfully, is transferred to step
Rapid 8, conversely, being transferred to step 3.
Step 8, second controller is visited according to flag bit centering lower range GM counting tube detector and high range GM counting tube
The high-tension circuit for surveying device carries out on-off control, to be measured using suitable detector, if γ radiation detection probe is to spy
It surveys device control on-off success and detector measurement counts in the preset judgement range of second controller, be transferred to step 9, conversely,
Flag bit is reseted, step 7 is transferred to；
Step 9, γ radiation detection probe sends detection data to showing that treatment box is shown on the spot, and terminates to run.
The wide-range region γ radiation detector of embodiment 1 is tested for the property using the method that embodiment 2 provides, is surveyed
Test result is as shown in table 1；From testing result it is found that γ radiation detector detection error in wide-range region provided by the invention is far small
In technical requirements (≤± 15%), and to the measurement of high low dose rate precision with higher, it is particularly suitable for nuclear leve γ radiation
Detection.
The gamma dose rate test result for the wide-range region γ radiation detector that 1 embodiment 1 of table provides
| Test cases | Standard value (μ Gy/h) | Measured value (μ Gy/h) | Measurement error (%) | Error requirements |
| 1 | 0.758 | 0.825 | 8.8 | ≤ ± 15% |
| 2 | 5.71 | 5.40 | -3.0 | ≤ ± 15% |
| 3 | 81.4 | 79.1 | -2.6 | ≤ ± 15% |
| 4 | 609 | 635 | 4.3 | ≤ ± 15% |
| 5 | 9.48×103 | 9.36×103 | -1.3 | ≤ ± 15% |
| 6 | 5.72×104 | 5.41×104 | -5.5 | ≤ ± 15% |
| 7 | 4.49×105 | 4.33×105 | -3.6 | ≤ ± 15% |
| 8 | 5.73×106 | 5.86×106 | 2.2 | ≤ ± 15% |
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (8)
1. for the wide-range region γ radiation detector of complicated radiation environment, including showing treatment box and γ radiation detection on the spot
Probe, it is described to show that treatment box is connected with γ radiation detection probe by the communications cable on the spot, which is characterized in that
It is described to show that treatment box includes the first controller, AC power source breaker, filter, power module, DC power supply on the spot
Breaker and communication interface；First controller is connect with each communication interface, sends detection for popping one's head in γ radiation detection
Relevant control instructs and collects and handle the detection information that γ radiation detection probe is sent；The AC power source breaker is used
In the control external ac power source input wide-range region γ radiation detector for complicated radiation environment；The outside of input
AC power source is successively converted into DC power supply after filter and power module, and it is disconnected to be delivered to the first controller and DC power supply
Road device；
The DC power supply breaker and communication interface for showing treatment box on the spot are connected by the communications cable and γ radiation detection probe；
The communications cable is for showing treatment box and γ radiation detection probe information exchange on the spot and providing for γ radiation detection probe straight
Galvanic electricity source；
The γ radiation detection probe includes second controller, power supply processing circuit, communication interface, high-voltage control circuit, signal
Processing circuit, middle lower range GM counting tube detector and high range GM counting tube detector；The power supply processing circuit will on the spot
The DC power supply that display treatment box transmits is converted and is filtered, supply second controller, high-voltage control circuit and signal processing
Circuit uses；The communication interface is used for connection communication cable and second controller；The high-voltage control circuit is for generating height
Lower range GM counting tube detector and high range GM counting tube detector use in voltage source supply；The signal processing circuit will
The current impulse that middle lower range GM counting tube detector or high range GM counting tube detector generate is converted to voltage signal, then by
After amplifier is amplified to suitable amplitude, pulse signal is converted to by comparator, second controller is sent to and carries out data processing；Institute
Second controller is stated for high-voltage control circuit and the detection of middle lower range GM counting tube detector and high range GM counting tube
The high pressure on-off of device is controlled.
2. the wide-range region γ radiation detector according to claim 1 for complicated radiation environment, which is characterized in that
It pops one's head in including at least two γ radiation detections, and the quantity of the communications cable and γ radiation detection probe are consistent；Each DC power supply
Breaker and each communication interface are connected by the same group of communications cable and a γ radiation detection probe.
3. the wide-range region γ radiation detector according to claim 1 or 2 for complicated radiation environment, feature exist
In the second controller controls high-voltage control circuit using Time-to-Count technology, counts middle lower range GM
Pipe detector or high range GM counting tube detector are in the recurrent state of " detection-suspend mode ".
4. the wide-range region γ radiation detector according to claim 3 for complicated radiation environment, which is characterized in that
The measuring range of the middle lower range GM counting tube detector is 0.05 Gy/h~2.0 × 10 μ4μ Gy/h, the high range GM meter
100 Gy/h~1.0 × 10 μ of measuring range of number pipe detector7μGy/h。
5. the wide-range region γ radiation detector according to claim 1 for complicated radiation environment, which is characterized in that
The external input AC power source is 220V AC power source, and the high-voltage control circuit output voltage range is 200V~1250V.
6. the wide-range region γ radiation detector according to claim 1 or 2 for complicated radiation environment, feature exist
In described to show that treatment box further includes display and key on the spot；Shown display is defeated as the display for showing treatment box on the spot
Equipment out, for showing working condition and current count and the related setting information of γ radiation detection probe；The key is made
For the standard input device of the first controller, the setting of various parameters is completed.
7. the wide-range region γ radiation detector according to claim 1 or 2 for complicated radiation environment, feature exist
In described to show that treatment box further includes buzzer and alarm lamp on the spot；The buzzer and alarm lamp are in the first control
Device processed monitors to provide sound-light alarm under pollution condition.
8. based on the described in any item wide-range region γ radiation detectors for complicated radiation environment of claim 1 to 7
Detection method, which comprises the steps of:
Step 1, show that treatment box is sent out the detection instruction of inquiry γ radiation detection probe on the spot, if detecting γ radiation inspection
Probing head, is transferred to step 2；
Step 2, show that treatment box sends the parameter configuration instruction of γ radiation detection probe on the spot, the parameter includes warning level
Value, detector correction factor；The configuration successful if γ radiation detection is popped one's head in, the configured successful instruction of transmission is back to be shown on the spot
Treatment box is transferred to step 3；
Step 3, in first measurement, lower range GM counting tube detector is detected γ radiation detection probe in use, passes through survey
The high pressure of amount therefrom lower range GM counting tube detector establishes to first pulse the time generated and the counting measured
Value to estimate the radiation intensity in surveyed place, and sets flag bit according to estimation results, and flag bit is arranged successfully, is transferred to step
4；
Step 4, second controller is according to flag bit centering lower range GM counting tube detector and high range GM counting tube detector
High-tension circuit carry out on-off control, to be measured using suitable detector, if γ radiation detection probe is to detector
It controls on-off success and detector measurement counts in the preset judgement range of second controller, be transferred to step 5；
Step 5, γ radiation detection probe sends detection data to showing that treatment box is shown on the spot.
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| CN113238274A (en) * | 2021-05-26 | 2021-08-10 | 西安中核核仪器有限公司 | Wide-range coaxial through-wall double-ionization-chamber area gamma radiation detection method |
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Application publication date: 20191119 |