CN105492929A - Radiation detection device, radiation dosimetry processing method, and radiation dosimetry processing program - Google Patents
Radiation detection device, radiation dosimetry processing method, and radiation dosimetry processing program Download PDFInfo
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- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
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Abstract
The purpose of the present invention is to provide: a radiation detection device whereby sensitivity of light detection can be increased despite using a simple photodetector having a small light receiving surface area and low sensitivity of light detection, and sensitivity of radiation detection can be increased as a result; a radiation dosimetry processing method; and a radiation dosimetry processing program. The configuration for achieving this purpose is provided with a radiation detection unit (2) for generating a radiation detection signal corresponding to the energy of incident radiation (R), a stochastic resonance unit (7) for causing a stochastic resonance effect in the radiation detection signal generated by the radiation detection unit (2) and outputting a waveform reproduction signal in which the waveform of the radiation detection signal is reproduced, and a calculation unit (8) for measuring a radiation dose on the basis of the waveform reproduction signal generated by the stochastic resonance unit (7).
Description
Technical field
The present invention relates to the radiation detecting apparatus of the middle mensuration radiological doses such as nuclear facilities, radiation dose measurement disposal route and radiation dose measurement handling procedure.
Background technology
In the past, in the radiation detecting apparatus that the detection of radioactive in nuclear facilities etc. is polluted, the pick-up unit with scintillator was installed.As a kind of solid scintillator of this scintillator, have and carry out producing high-molecular and the plastic scintillant such as polystyrene, polyvinyl-toluene manufactured by dissolving the fluorophor such as anthracene, talan (stilbenzene) in the organic solvent such as styrene, toluene.
This plastic scintillant is compared with crystalline inorganic scintillator, and easy processing and forming becomes large-area film shape or elongated shape etc., and due to light and there is flexibility, therefore impact resistance is excellent, and cost is low, easily obtain, be therefore used in various radiation detecting apparatus.In addition, plastic scintillant due to material proportion little, gamma-rays sensitivity is lower, the highly sensitive radiation detecting apparatus that to be therefore applicable to β ray be determination object.
Here, the radiation detecting apparatus described in patent documentation 1 comprises: the slim scintillator of large area, and it is configured in the inner upper of detecting device container, produces and the passage of scintillation light from the corresponding amount of the radiological dose of external incident; And multiple slim condensing body, the plurality of slim condensing body and the slim scintillator of large area are configured in the inside of detecting device container abreast, carry out optically focused to by the passage of scintillation light produced in the slim scintillator of this large area.This radiation detecting apparatus comprises: be attached at the photomask in the detecting device outer lateral side of the slim scintillator of large area; And multiple photo detector, the plurality of photo detector is configured on the focal point of multiple slim condensing body in the mode of its sensitive surface towards slim condensing body, and the light received is converted to electric signal outputs to counting circuit.By adopting this structure, this radiation detecting apparatus can improve the detection sensitivity of radioactive ray.
Prior art document
Patent documentation
Patent documentation 1: Japanese Patent Laid-Open 8-248139 publication
Summary of the invention
Invent technical matters to be solved
But, in radiation detecting apparatus in the past, have employed and the higher large area photo detector of light detection sensitivity is set or multiple photo detector received passage of scintillation light is set to improve the structure of light detection sensitivity, therefore apparatus structure is complicated and maximize, and the sensitivity obtained is difficult to the light detection sensitivity exceeding photomultiplier.
On the other hand, when carrying out light guiding to passage of scintillation light thus adopt the less single photo detector of light-receiving area, in order to improve light detection sensitivity, photomultiplier is used to be used as photo detector.In this situation, there is the problem that installation cost uprises.
The present invention completes in view of the foregoing, its object is to provide a kind of radiation detecting apparatus, radiation dose measurement disposal route and radiation dose measurement handling procedure, even if use less, that light detection sensitivity the is lower easy photo detector of light-receiving area also can improve light detection sensitivity, thus radioactive ray detection sensitivity can be improved.
For the technical scheme of dealing with problems
For solving the problem, realize goal of the invention, the feature of radiation detecting apparatus of the present invention is, comprising: radioactive ray test section, and this radioactive ray test section generates radiation detection signal according to the energy of incident radioactive ray; Accidental resonance portion, the radiation detection signal that this accidental resonance portion makes described radioactive ray test section generate produces Stochastic Resonance Phenomenon and carries out wave recovery to described radiation detection signal, and exports thus obtained wave recovery signal; And operational part, the wave recovery signal measurement radiological dose that this operational part generates based on described accidental resonance portion.
In addition, the feature of radiation detecting apparatus of the present invention is, in the present invention as stated above, described accidental resonance portion comprises: noise adder, and the radiation detection signal that this noise adder makes described radioactive ray test section generate is added with noise signal and generates noise additive signal; Threshold process portion, this threshold process portion carries out threshold process, that is, when the noise additive signal that described noise adder generates is more than the threshold value specified, export the pulse signal of high level; And wave recovery portion, the wave recovery signal that this wave recovery portion obtains after exporting and having carried out smoothing processing to the pulse signal exported from described threshold process portion.
In addition, the feature of radiation detecting apparatus of the present invention is, in the present invention as stated above, described accidental resonance portion parallel connection is configured with multiple accidental resonance basic portion, the plurality of accidental resonance basic portion comprises: noise adder, and the radiation detection signal that this noise adder makes described radioactive ray test section generate is added with noise signal and generates noise additive signal; And threshold process portion, this threshold process portion carries out threshold process, namely, when the noise additive signal that described noise adder generates is more than the threshold value specified, export the pulse signal of high level, this radiation detecting apparatus also comprises: pulse adder, and this pulse adder exports the pulse additive signal to obtaining after the pulse signal summation exported from each random vibration basic portion; And wave recovery portion, the wave recovery signal that this wave recovery portion obtains after exporting and having carried out smoothing processing to the pulse additive signal of described pulse adder output.
In addition, the feature of radiation dose measurement disposal route of the present invention is, make the energy according to incident radioactive ray and the radiation detection signal that generates produces Stochastic Resonance Phenomenon and carries out wave recovery to described radiation detection signal, and export thus obtained wave recovery signal, based on described wave recovery signal measurement radiological dose.
In addition, the feature of radiation dose measurement handling procedure of the present invention is, processor is made to perform following process: to make the energy according to incident radioactive ray and the radiation detection signal that generates produces Stochastic Resonance Phenomenon and carries out wave recovery to described radiation detection signal, and export thus obtained wave recovery signal, based on described wave recovery signal measurement radiological dose.
Invention effect
According to the present invention, radiation detection signal generation Stochastic Resonance Phenomenon radioactive ray test section being generated due to accidental resonance portion carries out wave recovery to described radiation detection signal, and export thus obtained wave recovery signal, even if therefore use light-receiving area less and light detection sensitivity is lower simple and easy photo detector also can improve light detection sensitivity, thus radioactive ray detection sensitivity can be improved.
Accompanying drawing explanation
Fig. 1 is the integrally-built schematic diagram of the radiation detecting apparatus representing embodiments of the present invention 1.
Fig. 2 is the block diagram of the detailed construction representing accidental resonance portion.
Fig. 3 represents the figure being input to the radiation detection signal in accidental resonance portion and the time domain waveform of input signal.
Fig. 4 is the figure of the time domain waveform representing the noise additive signal that noise totalizer exports.
Fig. 5 is the figure of the time domain waveform representing the threshold process signal that comparer exports.
Fig. 6 is the figure representing the time domain waveform utilizing adder to the additive signal obtained after all threshold process signal summations.
Fig. 7 is the figure representing the time domain waveform that namely the wave recovery signal exported from wave recovery portion outputs signal.
Fig. 8 is the circuit diagram of the structure in the accidental resonance portion representing embodiments of the present invention 2.
Fig. 9 is the process flow diagram of the radiation dose measurement treatment step involved by radiation dose measurement handling procedure representing embodiment of the present invention 3.
Embodiment
Below, be described for implementing mode of the present invention with reference to accompanying drawing.
(embodiment 1)
[one-piece construction]
Fig. 1 is the integrally-built schematic diagram of the radiation detecting apparatus representing embodiments of the present invention 1.As shown in Figure 1, radiation detecting apparatus 1 has radioactive ray test section 2 and signal processing part 3.Radioactive ray test section 2 has scintillator 4, photoconduction 5 and photo detector 6.Signal processing part 3 has accidental resonance portion 7 and operational part 8.
Scintillator 4 after external incident, produces the passage of scintillation light corresponding with the energy of radioactive ray R at radioactive ray R, makes passage of scintillation light incide the photoconduction 5 supported scintillator 4.Photoconduction 5 is tapered, and the end face that its area is larger is configured with scintillator 4, and the less other end of area is configured with photo detector 6.The passage of scintillation light inciding photoconduction 5 arrives the less photo detector 6 of light-receiving area through multiple reflections.Photo detector 6 according to the incident light quantity of passage of scintillation light export after opto-electronic conversion by light signal, and using this output signal as the accidental resonance portion 7 input signal Vin in accidental resonance portion 7 being outputted to signal processing part 3.This input signal Vin is the radiation detection signal detected by radioactive ray test section 2.
Accidental resonance portion 7 by accidental resonance process to cannot detect in the past, the faint input signal Vin be mixed in noise carries out highly sensitive wave recovery.Accidental resonance refers to following this phenomenon: if apply a certain suitable noise to the nonlinear system potentially with weak beat (feeble signal), then the beat (feeble signal) hidden become obvious on the contrary, thus to go out with good sensitivity technique.Accidental resonance portion 7 makes the input signal Vin generation Stochastic Resonance Phenomenon inputted from photo detector 6 carry out wave recovery to radiation detection signal, generates wave recovery signal, namely outputs signal Vout, and output signal Vout is outputted to operational part 8.Here, usually, the radiation detection signal (input signal Vin) of radioactive ray R is the signal of pulse type, and output signal Vout is also pulse-like signal.Operational part 8 carries out the computing of measuring radiological dose based on the size and number that namely pulse-like signal outputs signal Vout.In addition, the radiological dose as operation result is output to not shown display part, Department of Communication Force etc.
[structure in accidental resonance portion]
Fig. 2 is the block diagram of the detailed construction representing accidental resonance portion 7.As shown in Figure 2, accidental resonance portion 7 has four accidental resonance basic portion 40a ~ 40d, adder 30 and wave recovery portion 50.Four accidental resonance basic portion 40a ~ 40d are connected in parallel, and input has input signal Vin respectively.
Each accidental resonance basic portion 40a ~ 40d has noise adder 10a ~ 10d and threshold process portion 20a ~ 20d respectively.Noise adder 10a ~ 10d has noise adder 11a ~ 11d and noise source 12a ~ 12d respectively.In addition, threshold process portion 20a ~ 20d has threshold voltage source 21a ~ 21d and comparer 22a ~ 22d respectively.
Noise signal Vn1 ~ the Vn4 exported from noise source 12a ~ 12d is respectively added with inputted input signal Vin by each noise totalizer 11a ~ 11d respectively, thus outputs to comparer 22a ~ 22d respectively as noise additive signal Va1 ~ Va4.In addition, noise signal Vn1 ~ Vn4 is mutual incoherent signal.In addition, noise signal Vn1 ~ Vn4 is preferably white noise signal, but is not limited to this, also can be the noise signal of other kind.
Threshold signal Vth1 ~ Vth4 that each comparer 22a ~ 22d inputs above-mentioned noise additive signal Va1 ~ Va4 respectively and exports from each threshold voltage source 21a ~ 21d.Each comparer 22a ~ 22d when the noise additive signal Va1 ~ Va4 inputted respectively respectively at threshold signal Vth1 ~ more than Vth4, export the threshold process signal Vc1 ~ Vc4 of high level pulse signal, when noise additive signal Va1 ~ Va4 is respectively lower than threshold signal Vth1 ~ Vth4, the threshold process signal Vc1 ~ Vc4 of output low level pulse signal.This threshold process signal Vc1 ~ Vc4 is imported into adder 30.In addition, the value of threshold signal Vth1 ~ Vth4 is set as the value that the signal level of noise level and the noise signal Vn1 ~ Vn4 comprised than input signal Vin is large.
Adder 30 is sued for peace to four the threshold process signal Vc1 ~ Vc4 inputted from each comparer 22a ~ 22d, and outputs to wave recovery portion 50 as additive signal Vad.Wave recovery portion 50, to the inputted smoothing process of additive signal Vad, exports and carries out the output signal Vout after wave recovery to original input signal Vin.
Here, each accidental resonance basic portion 40a ~ 40d makes the S/N of input signal Vin improve, and produces the Stochastic Resonance Phenomenon that can improve detection sensitivity.Usually, feeble signal below the value of threshold signal Vth1 ~ Vth4 cannot detect, if but use this accidental resonance basic portion 40a ~ 40d, then can utilize random resonance phenomenon, even thus the feeble signal (input signal Vin) below the value of threshold signal Vth1 ~ Vth4, also only the input signal Vin be mixed in noise can be highlighted and export.
[signal waveform in accidental resonance portion]
Then, be described based on the process of the signal waveform in accidental resonance portion 7 to accidental resonance portion 7.First, Fig. 3 is the figure of the time domain waveform representing input signal Vin.As shown in Figure 3, although be mixed into noise in input signal Vin, in period ta, there is the pulse type radiation detection signal P that photo detector 6 detects.Because this pulse type radiation detection signal P is the feeble signal be mixed in noise, therefore cannot detect in the past.
Fig. 4 is the figure of the time domain waveform representing the noise additive signal Va1 that noise totalizer 11a exports.As shown in Figure 4, noise additive signal Va1 obtains after being added with noise signal Vn1 by input signal Vin.By applying this noise signal Vn1, the noise signal Vn1 in period ta is made to reach more than threshold signal Vth1.
Fig. 5 is the figure of the time domain waveform representing the threshold process signal Vc1 that comparer 22a exports.As shown in Figure 5, in period ta, due to Stochastic Resonance Phenomenon, the pulse-like signal P1 corresponding with pulse type radiation detection signal P is output.
Fig. 6 be represent by adder 30, all threshold process signal Vc1 ~ Vc4 is added after the figure of the time domain waveform of additive signal Vad that obtains.According to this additive signal Vad, then export close to the waveform of pulse type radiation detection signal P, i.e. stepped signal P2 at period ta.
Fig. 7 is the figure of the time domain waveform representing the output signal Vout exported from wave recovery portion 50.Wave recovery portion 50 is frequency filter circuit specifically, is the low-pass filter stair-stepping high fdrequency component removed.In addition, the cutoff frequency of low-pass filter needs to be set as value enough large compared with the signal frequency calculated according to the pulse width of pulse type radiation detection signal P.In Fig. 7, the additive signal Vad shown in wave recovery signal P3 and Fig. 6 that period ta occurs compares comparatively level and smooth, and has recovered the waveform roughly the same with the signal waveform of pulse type radiation detection signal P.
In addition, in Stochastic Resonance Phenomenon, because noise signal Vn1 ~ Vn4 is mutual incoherent signal, the number in parallel therefore by increasing accidental resonance basic portion 40a ~ 40d carries out the wave recovery closer to pulse type radiation detection signal P.In addition, in Fig. 2, the number in parallel of accidental resonance basic portion 40a ~ 40d is set to 4, but this numeral illustrate only an example.
In present embodiment 1, the accidental resonance portion 7 of easy structure is utilized to produce Stochastic Resonance Phenomenon, unwanted noise can be removed from input signal Vin, thus significantly can improve the S/N ratio of pulse type radiation detection signal P, therefore can improve radioactive ray detection sensitivity with easy structure.
In addition, in present embodiment 1, even if such as do not use the photo detector of the costlinesses such as photomultiplier, the low cost semiconductor light-receiving devices such as avalanche photodide also can be utilized to improve radioactive ray detection sensitivity.
In addition, above-mentioned signal processing part 3 can carry out analog signal processing, also can carry out A/D conversion to input signal Vin and carry out digital signal processing.When carrying out digital signal processing, FPGA is preferably utilized to carry out integrated signal handling part 3.
(embodiment 2)
Have employed the structure of four accidental resonance basic portion 40a ~ 40d parallel connection in above-mentioned embodiment 1, but also can only utilize an accidental resonance basic portion 40a to form accidental resonance portion 7.
Fig. 8 is the circuit diagram of the structure in the accidental resonance portion representing embodiments of the present invention 2.As shown in Figure 8, accidental resonance portion 17 has the accidental resonance basic portion 40a and wave recovery portion 60 that the embodiment 1 be configured in accidental resonance portion 7 uses.Input signal Vin is outputted to wave recovery portion 60 as the threshold process signal Vc1 shown in Fig. 5 by accidental resonance basic portion 40a.Wave recovery portion 60 carries out moving average to the pulse-like signal P1 corresponding with pulse type radiation detection signal P in the sampling period of regulation, finally from pulse-like signal P1, recovers pulse type radiation detection signal P thus obtains and generate wave recovery signal P3.Then, wave recovery signal P3 exports as output signal Vout by wave recovery portion 60.In addition, moving average is a kind of low-pass filtering treatment.
(embodiment 3)
Signal processing part 3 in above-mentioned embodiment 1,2 have employed the hardware configurations such as electronic loop, but in present embodiment 3, by utilizing the digital signal processing of software to carry out the process corresponding with signal processing part 3.In addition, this digital signal processing is performed by radiation dose measurement handling procedure.In this situation, high-speed a/d conversion element etc. is used directly to carry out A/D conversion to input signal Vin, and being input in the arithmetic unit comprising CPU and storer, CPU uses the radiation dose measurement program of preserving in memory to perform a series of radiation dose measurement process, i.e. noise addition process, threshold process, addition process, wave recovery process, radiation dose measurement process etc.In addition, preferably signal processing part 3 is configured to by the arithmetic unit and radiation dose measurement handling procedure that comprise CPU and storer.In addition, CPU also can utilize program only to perform the process in accidental resonance portion 7.
Fig. 9 is the process flow diagram of the radiation dose measurement treatment step involved by radiation dose measurement handling procedure representing embodiment of the present invention 3.As shown in Figure 9, first, parallel processing (step S101a, S102a, S101b, S102b, S101c, S102c, S101d, S102d) is carried out in the CPU pair of process corresponding with accidental resonance basic portion 40a ~ 40d.That is, CPU carries out parallel processing to following first ~ four process: after the addition process (step S101a) corresponding with noise adder 10a, carry out first of the threshold process (step S102a) corresponding with threshold process portion 20a process; After the addition process (step S101b) corresponding with noise adder 10b, carry out second of the threshold process (step S102b) corresponding with threshold process portion 20b process; After the addition process (step S101c) corresponding with noise adder 10c, carry out the 3rd of the threshold process (step S102c) corresponding with threshold process portion 20c process; And after the addition process (step S101d) corresponding with noise adder 10d, carry out the 4th of the threshold process (step S102d) corresponding with threshold process portion 20d process.
Afterwards, CPU carries out the addition process (step S103) corresponding with adder 30.Afterwards, CPU carries out the wave recovery process (step S104) corresponding with wave recovery portion 50.In addition, CPU also carries out the measurement processing (step S105) of the radiological dose corresponding with operational part 8.Afterwards, CPU repeats above-mentioned process in the sampling period of each regulation.In addition, whole above-mentioned process is carried out to each sampled data of input signal Vin.Here, the seasonal effect in time series in past adopts data to be saved in storer and processes by the measurement processing of the wave recovery process of step S104, the radiological dose of step S105.
In present embodiment 3, utilize radiation dose measurement handling procedure to carry out the process of signal processing part 3, therefore can design flexibly and design alteration various radiation detecting apparatus, and significantly can cut down circuit components.
In addition, in above-mentioned embodiment 1 ~ 3, radioactive ray test section 2 uses scintillator 4, receives the passage of scintillation light from this scintillator 4 by photo detector 6, thus detects pulse type radiation detection signal P.But be not limited to this, also can not use scintillator 4, and utilize the radiation detection device of direct-detection radioactive ray to detect pulse type radiation detection signal P.That is, as long as radioactive ray test section 2 can generate the output signal (pulse type radiation detection signal P) corresponding with the energy of incident radioactive ray R.
Label declaration
1 radiation detecting apparatus
2 radioactive ray test sections
3 signal processing parts
4 scintillators
5 photoconductions
6 photo detectors
7,17 accidental resonance portions
8 operational parts
10a ~ 10d noise adder
11a ~ 11d noise adder
12a ~ 12d noise source
20a ~ 20d threshold process portion
21a ~ 21d threshold voltage source
22a ~ 22d comparer
30 adders
40a ~ 40d accidental resonance basic portion
50,60 wave recovery portions
P pulse type radiation detection signal
P1 pulse-like signal
The stepped signal of P2
P3 wave recovery signal
R radioactive ray
During ta
Va1 ~ Va4 noise additive signal
Vad additive signal
Vc1 ~ Vc4 threshold process signal
Vin input signal
Vn1 ~ Vn4 noise signal
Vout outputs signal
Vth1 ~ Vth4 threshold signal
Claims (5)
1. a radiation detecting apparatus, is characterized in that, comprising:
Radioactive ray test section, this radioactive ray test section generates radiation detection signal according to the energy of incident radioactive ray;
Accidental resonance portion, the radiation detection signal that this accidental resonance portion makes described radioactive ray test section generate produces Stochastic Resonance Phenomenon and carries out wave recovery to described radiation detection signal, and exports thus obtained wave recovery signal; And
Operational part, the wave recovery signal measurement radiological dose that this operational part generates based on described accidental resonance portion.
2. radiation detecting apparatus as claimed in claim 1, is characterized in that,
Described accidental resonance portion comprises:
Noise adder, the radiation detection signal that this noise adder makes described radioactive ray test section generate is added with noise signal and generates noise additive signal;
Threshold process portion, this threshold process portion carries out threshold process, that is, when the noise additive signal that described noise adder generates is more than the threshold value specified, export the pulse signal of high level; And
Wave recovery portion, the wave recovery signal that this wave recovery portion obtains after exporting and having carried out smoothing processing to the pulse signal exported from described threshold process portion.
3. radiation detecting apparatus as claimed in claim 1, is characterized in that,
Described accidental resonance portion parallel connection is configured with multiple accidental resonance basic portion, and the plurality of accidental resonance basic portion comprises:
Noise adder, the radiation detection signal that this noise adder makes described radioactive ray test section generate is added with noise signal and generates noise additive signal; And
Threshold process portion, this threshold process portion carries out threshold process, that is, when the noise additive signal that described noise adder generates is more than the threshold value specified, export the pulse signal of high level,
This radiation detecting apparatus also comprises:
Pulse adder, this pulse adder exports the pulse additive signal to obtaining after the pulse signal summation exported from each random vibration basic portion; And
Wave recovery portion, the wave recovery signal that this wave recovery portion obtains after exporting and having carried out smoothing processing to the pulse additive signal of described pulse adder output.
4. a radiation dose measurement disposal route, is characterized in that,
Make the energy according to incident radioactive ray and the radiation detection signal that generates produces Stochastic Resonance Phenomenon and carries out wave recovery to described radiation detection signal, and export thus obtained wave recovery signal,
Based on described wave recovery signal measurement radiological dose.
5. a radiation dose measurement handling procedure, is characterized in that,
Processor is made to perform following process:
Make the energy according to incident radioactive ray and the radiation detection signal that generates produces Stochastic Resonance Phenomenon and carries out wave recovery to described radiation detection signal, and export thus obtained wave recovery signal,
Based on described wave recovery signal measurement radiological dose.
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| JP2014-037222 | 2014-02-27 | ||
| JP2014037222 | 2014-02-27 | ||
| PCT/JP2014/070513 WO2015129069A1 (en) | 2014-02-27 | 2014-08-04 | Radiation detection device, radiation dosimetry processing method, and radiation dosimetry processing program |
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| CN105492929A true CN105492929A (en) | 2016-04-13 |
| CN105492929B CN105492929B (en) | 2017-06-13 |
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| JP7434135B2 (en) * | 2020-11-05 | 2024-02-20 | 株式会社東芝 | radiation detector |
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| JPWO2015129069A1 (en) | 2017-03-30 |
| WO2015129069A1 (en) | 2015-09-03 |
| JP5861803B1 (en) | 2016-02-16 |
| CN105492929B (en) | 2017-06-13 |
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