CN104749603A - Nuclear radiation detection method suitable for complex radiation background - Google Patents
Nuclear radiation detection method suitable for complex radiation background Download PDFInfo
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- CN104749603A CN104749603A CN201510120819.6A CN201510120819A CN104749603A CN 104749603 A CN104749603 A CN 104749603A CN 201510120819 A CN201510120819 A CN 201510120819A CN 104749603 A CN104749603 A CN 104749603A
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Abstract
The invention provides a nuclear radiation detection method suitable for a complex radiation background. The nuclear radiation detection method suitable for the complex radiation background includes: combining a traditional measurement method with a modern digital signal processing technology, fully using information acquired by a nuclear radiation detector, and achieving quick and accurate judgment for nuclear radiation energy and strength. The nuclear radiation detection method suitable for the complex radiation background uses a high speed data acquisition card to acquire gamma pulse signals output from an HPGE (high purity germanium) detector, and inputs the gamma pulse signals into a data acquisition and processing unit after performing AD (analog-digital) conversion and smoothing on the gamma pulse signals. Then, a data processing unit converts a large number of the gamma pulse signals into gamma energy spectra. Finally, continuous wavelet transformation in wavelet analysis is adopted to convert the gamma energy spectra, and converts the gamma energy spectra to an energy-dimension plane, and then wavelet coefficients of the gamma energy spectra under different dimensions are obtained. In the end, quick and accurate positioning for a characteristic peak position is achieved and quick calculation for the peak area is achieved according to characteristics of gamma characteristic peak wavelet coefficients in the energy-dimension plane.
Description
Technical field
The invention belongs to technical field of nuclear radiation measurement, be specifically related to a kind of nuclear radiation detection method be applicable under complicated radiation background.
Background technology
Nuclear energy power generation is clean as one, economical, energy production mode reliably, for environmental protection and sustainable economic development significant, its status shared in my energy construction is more and more higher.But such as the Nuclear Accidents of the nuclear power station such as " Chernobyl ", " Three Mile Island " and " Fukushima " causes bitter lesson to the mankind.Accordingly, the safety of national health, life and property in order to ensure the people, takes series of measures and builds omnibearing Nuclear Safety prevention and control system.Build this system, need to carry out judging in real time, accurately to the radioactive level of the radioactive nuclide in surrounding environment and sample and nucleic, this is not only abnormal important for nuclear power developing itself, also has important strategic importance for increasingly serious national core anti-terrorism, nuclear safeguards.Based on the gamma spectrum analytical technology of high purity germanium detector, there is in above environmental monitoring, radiation protection, the contour background of Nuclear Safety Inspection, low-level surveying work application widely.The gamma spectrum that high purity germanium detector obtains has good energy resolving power, but, due to its little detection efficiency (generally within 5%), so want to reach desirable testing result, need to measure for a long time sample.This often makes us can not make and judging fast and accurately nuclear radiation, nuclear leakage accident, thus makes science, effective emergency measure.Especially under complicated radiation background, because the statistic fluctuation of power spectrum is large, interference emission is many, be easy to cause failing to judge and judging by accident of nuclear radiation.At present, a lot of people proposes and adopts that the tower algorithm of mallat (wavelet transform) in wavelet analysis method is smoothing to power spectrum, filtering process, but effect is undesirable, does not fundamentally solve this difficult problem.
Summary of the invention
In order to solve problems of the prior art, the present invention proposes a kind of nuclear radiation detection method be applicable under complicated radiation background, traditional nuclear radiation measurement technology combines with modern signal processing by the present invention, high-speed data acquisition card is adopted to obtain γ pulse signal, the method of continuous wavelet transform is adopted to analyze gamma spectrum, both significantly improve the accuracy of nuclear radiation measurement, substantially reduce Measuring Time again.
For achieving the above object, the technical scheme that the present invention takes is:
Be applicable to the nuclear radiation detection method under complicated radiation background, its measurement mechanism comprises HPGe detector, high-voltage power supply, low-tension supply, liquid nitrogen, prime amplifier, high-speed data acquisition card and data acquisition and processing unit.Described high-voltage power supply is used for providing operating voltage to HPGe detector, and described low-tension supply is used for powering to prime amplifier, and liquid nitrogen is for cooling HPGe detector.HPGe detector exports γ pulse signal to prime amplifier, transfers to high-speed data acquisition card after the γ pulse signal amplification that HPGe detector exports by prime amplifier, shaping.Described high-speed data acquisition card sample frequency is 2Gbps, γ pulse signal becomes digital gamma pulse carry out AD conversion, filtering in high-speed data acquisition card after, digital gamma pulse is sent to data acquisition in computing machine and processing unit through USB data line, and is converted to gamma spectrum by data acquisition and processing unit.Concrete enforcement comprises the following steps:
The acquisition of a, gamma spectrum data: the gamma-rays being incident to high purity germanium detector, by photoelectric effect, Compton effect and pair effect off-energy, exports containing noisy γ pulse signal at detector output terminal.γ pulse is transported to high-speed data acquisition card after prime amplifier amplification, shaping, becomes digital gamma pulse after the AD converter in capture card, filter process.Finally, digital gamma pulse is transferred to data acquisition and the processing unit of computing machine, and is converted into gamma spectrum.
B, gamma spectrum data analysis: according to the feature of γ characteristic peak in power spectrum, adopt, based on the method for continuous wavelet transform, express-analysis is carried out to gamma spectrum, to in environment or sample with or without radioactive nuclide, how have the radioactive level of what radioactive nuclide, radioactive nuclide, make and judging fast, accurately.
Further, the high-speed data acquisition card of described data collecting card to be sample frequency be 2Gbps.
Further, adopt the method for the continuous wavelet transform in wavelet analysis, gamma spectrum is converted to energy-yardstick plane.
Further, in gamma spectrum data analysis, bior2.6 wavelet function is adopted to carry out the continuous wavelet transform of 10 yardsticks to power spectrum.
Further, after gamma spectrum continuous wavelet transform, in power spectrum, the wavelet coefficient of γ characteristic peak increases with the increase of yardstick.
Further, the characteristic peak in power spectrum is linearly relevant to characteristic peak area at the wavelet coefficient of 10 yardsticks.
Beneficial effect of the present invention is: method therefor has stronger antijamming capability, higher sensitivity, so, the present invention under the condition under high background, low-level complex environment and lower than traditional measurement method more than 10 times of Measuring Time, can judge kind and the intensity of nuclear radiation more weak in environment, sample accurately, fast.Thus effectively raise the efficiency of nuclear emergency, nuclear safeguards and nuclear radiation Real-Time Monitoring.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Fig. 2 (a) for measuring through 7.5 hours, can district be pedotheque gamma spectrum between 1000 ~ 1500 roads (chn).
The continuous wavelet transform result that Fig. 2 (b) is gamma spectrum Fig. 2 (a) Suo Shi, that is, wavelet coefficient.
Fig. 3 (a) is 0.5 hour, can district is pedotheque gamma spectrum figure between 1000 ~ 1500 roads (chn) for Measuring Time.
Fig. 3 (b) adopts the present invention to the analysis result of gamma spectrum Fig. 3 (a) Suo Shi.
Mark in figure: n-counting rate, E
i-energy district, j-yardstick, W
s(10, i)-10 multi-scale wavelet coefficients.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1-Figure 3, a kind of nuclear radiation detection method be applicable under complicated radiation background, its pick-up unit comprises HPGe detector, high-voltage power supply, low-tension supply, liquid nitrogen, prime amplifier, high-speed data acquisition card and data acquisition and processing unit.High-voltage power supply is used for providing operating voltage to HPGe detector, and low-tension supply is used for powering to prime amplifier, and liquid nitrogen is for cooling HPGe detector.HPGe detector exports γ pulse signal to prime amplifier, prime amplifier is by transmitting high speed data capture card after the amplification of γ pulse signal, shaping, described high-speed data acquisition card sample frequency is 2Gbps, γ pulse becomes digital gamma pulse carry out AD conversion, filtering in high-speed data acquisition card after, digital gamma pulse is sent to data acquisition in computing machine and processing unit through USB data line, and is converted into gamma spectrum.
Concrete enforcement comprises the following steps:
The acquisition of a, digital gamma pulse signal: the gamma-rays being incident to HPGe detector, by off-energies such as photoelectric effect, Compton effect and pair effects, exports containing noisy γ pulse at HPGe detector output terminal.γ pulse is transfused to high-speed data acquisition card after prime amplifier amplification, shaping, becomes digital gamma pulse after the AD converter in high-speed collection card, filter process.Finally, digital gamma pulse is output to data acquisition and the processing unit of computing machine.
The acquisition of b, gamma spectrum: data acquisition and processing unit are divided into NGe Neng district according to the height of a large amount of γ pulse, and corresponding energy of γ ray is E
1~ E
n.Arbitrary energy district E
in often there is a γ pulse in (), Ze Gaineng district increases a counting (E
i(n → n+1)).After measurement, obtain the gamma spectrum of an one dimension, transverse axis coordinate (represents gamma-rays energy district E for " road (chn) "
i), the longitudinal axis represents gamma-ray counting rate n (relevant to gamma-ray radiation intensity), Fig. 2 (a) is through measurement in 7.5 hours, can district is pedotheque gamma spectrum between road, N=1000 ~ 1500 (chn), " peak " in spectrum is called γ characteristic peak, and each γ characteristic peak represents a kind of Characteristic γ ray.
C, employing bior2.6 wavelet function carry out 10 yardstick continuous wavelet transforms to gamma spectrum, gamma spectrum are converted to energy-yardstick plane, obtain the matrix of wavelet coefficients W that 10 row N arrange
s(j, i) (energy district index i=1 ~ N, scale index j=1 ~ 10), Fig. 2 (b) is depicted as the wavelet coefficient of Fig. 2 (a).
Continuous wavelet transform is defined as:
Wherein,
for wavelet function, j, i are respectively scale factor and shift factor, and E (t) represents gamma spectrum, and t represents can district-Dao (chn).
D, to each can district i (i=1 ~ N) wavelet coefficient W
s(j, i) judges, if the wavelet coefficient in the i-th energy district increases along with the increase of yardstick j (1 ~ 10), then judges to there is energy in power spectrum as E
iγ characteristic peak, that is, there is energy is E
igamma-rays, and record the wavelet coefficient of 10 yardsticks; Otherwise, judge that this energy district does not exist gamma-rays, and the corresponding wavelet coefficient of the 10th yardstick reset, that is, W
s(10, i)=0.
E, to all can district by after the operation of above-mentioned d step, the wavelet coefficient W (10 that 10th yardstick is non-vanishing, i) (i=1 ~ N) just characterizes gamma-emitting distribution situation, Fig. 3 (a) for Measuring Time be 0.5 hour, can pedotheque gamma spectrum between road, N=1000 ~ 1500, district (chn), Fig. 3 (b) is for adopting testing result of the present invention.Within 7.5 hours, measure power spectrum (Fig. 2 (a)) to be presented near 1310 and 1420 roads and to there is γ characteristic peak, within 0.5 hour, measure power spectrum (Fig. 3 (a)) display, these two characteristic peaks are very weak, and by spectrum in noise (counting statistics fluctuation) fall into oblivion.And after continuous wavelet transform process, their existence can be detected, and accurate location (Fig. 3 (b)) is carried out to their position.
F, the linear relationship obtaining characteristic peak intensity and wavelet coefficient via linear fit are: G=2.22*W
s-6.47.W
srepresent the wavelet coefficient W of 10 yardstick γ characteristic peaks
s(10, i), G is the intensity (peak area) of characteristic peak.Can the area at accurate judging characteristic peak according to above formula, and then the radiation intensity of ray can be determined.
Above-described embodiment just illustrating or explaining technical solution of the present invention, and the restriction that should not be construed as technical solution of the present invention, obviously, those skilled in the art can carry out various modifications and variations to the technology of the present invention and not depart from the spirit and scope of the technology of the present invention.If these amendments and modification belong within the scope of the technology of the present invention claim and equivalent technologies thereof, then the technology of the present invention also comprises these amendment and modification.
Claims (7)
1. one kind is applicable to the nuclear radiation detection method under complicated radiation background, it is characterized in that, adopt high-speed data acquisition card to carry out AD sampling, filtering process to the γ pulse signal that HPGe detector exports, the digital gamma pulse adopting the data acquisition in computing machine and processing unit to be exported by high-speed data acquisition card is converted into gamma spectrum.
2. a kind of nuclear radiation detection method be applicable under complicated radiation background according to claim 1, is characterized in that: the high-speed data acquisition card of to be sample frequency the be 2Gbps of employing.
3. a kind of nuclear radiation detection method be applicable under complicated radiation background according to claim 1, it is characterized in that: the method adopting the continuous wavelet transform in wavelet analysis, gamma spectrum is converted into energy-yardstick plane, obtains the wavelet coefficient of gamma spectrum under different scale.
4. a kind of nuclear radiation detection method be applicable under complicated radiation background according to claim 3, is characterized in that: continuous wavelet transform adopts the bior2.6 wavelet function in small echo series.
5. a kind of nuclear radiation detection method be applicable under complicated radiation background according to claim 3, is characterized in that: the continuous wavelet transform adopting 10 yardsticks.
6. a kind of nuclear radiation detection method be applicable under complicated radiation background according to claim 5, it is characterized in that: after continuous wavelet transform, in power spectrum, the wavelet coefficient of γ characteristic peak increases with the increase of yardstick.
7. a kind of nuclear radiation detection method be applicable under complicated radiation background according to claim 5, is characterized in that: the characteristic peak in power spectrum is linearly relevant to characteristic peak area at the wavelet coefficient of 10 yardsticks.
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Cited By (7)
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| CN106501293A (en) * | 2016-09-30 | 2017-03-15 | 深圳市赛宝伦科技有限公司 | A kind of method that XRF power spectrum background is deducted based on Wavelet Transform |
| CN106682263A (en) * | 2016-04-23 | 2017-05-17 | 上海大学 | Handheld mercury iodide nuclear radiation detector nuclear pulse signal processing and counting system and method |
| CN106896395A (en) * | 2017-04-27 | 2017-06-27 | 西南科技大学 | A kind of detection means of the faint emission signal based on sparse signal representation |
| CN108445029A (en) * | 2018-02-11 | 2018-08-24 | 奕瑞新材料科技（太仓）有限公司 | The method for improving Compton scatter imaging performance |
| CN109581460A (en) * | 2018-12-17 | 2019-04-05 | 苏州瑞派宁科技有限公司 | Composite detecting device |
| WO2020063629A1 (en) * | 2018-09-25 | 2020-04-02 | 北京超分科技有限公司 | Method and device for processing nuclear energy spectrum |
| CN116908904A (en) * | 2023-07-13 | 2023-10-20 | 黑龙江省原子能研究院 | Multi-path radiation detection energy spectrum analysis method and system based on pulse width measurement |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106682263A (en) * | 2016-04-23 | 2017-05-17 | 上海大学 | Handheld mercury iodide nuclear radiation detector nuclear pulse signal processing and counting system and method |
| CN106501293A (en) * | 2016-09-30 | 2017-03-15 | 深圳市赛宝伦科技有限公司 | A kind of method that XRF power spectrum background is deducted based on Wavelet Transform |
| CN106896395A (en) * | 2017-04-27 | 2017-06-27 | 西南科技大学 | A kind of detection means of the faint emission signal based on sparse signal representation |
| CN106896395B (en) * | 2017-04-27 | 2019-01-11 | 西南科技大学 | A kind of detection device of the faint emission signal based on sparse signal representation |
| CN108445029A (en) * | 2018-02-11 | 2018-08-24 | 奕瑞新材料科技（太仓）有限公司 | The method for improving Compton scatter imaging performance |
| WO2020063629A1 (en) * | 2018-09-25 | 2020-04-02 | 北京超分科技有限公司 | Method and device for processing nuclear energy spectrum |
| US11506803B2 (en) | 2018-09-25 | 2022-11-22 | Beijing Power-Resolution Technology Co. Ltd. | Method and device for processing nuclear energy spectrum |
| CN109581460A (en) * | 2018-12-17 | 2019-04-05 | 苏州瑞派宁科技有限公司 | Composite detecting device |
| CN109581460B (en) * | 2018-12-17 | 2021-02-26 | 苏州瑞派宁科技有限公司 | Composite detection device |
| CN116908904A (en) * | 2023-07-13 | 2023-10-20 | 黑龙江省原子能研究院 | Multi-path radiation detection energy spectrum analysis method and system based on pulse width measurement |
| CN116908904B (en) * | 2023-07-13 | 2024-03-29 | 黑龙江省原子能研究院 | Multi-path radiation detection energy spectrum analysis method and system based on pulse width measurement |
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Application publication date: 20150701 |