CN108646284A - A kind of gamma spectrum combined detection system and gamma spectrum measurement method - Google Patents
A kind of gamma spectrum combined detection system and gamma spectrum measurement method Download PDFInfo
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- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
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Abstract
The present invention provides a kind of gamma spectrum combined detection systems, the system is by the way that high energy resolution detector and high detection efficient detector to be combined, pass through data acquisition and procession module, high cost need not be used or extend the counting that time of measuring improves high energy resolution detector by realizing, and the gamma spectrum that just can reach high energy resolution and high detection efficient measures；The present invention also provides the methods of application system progress gamma spectrum measurement, this method is on the basis of the peak position of high energy resolution detector, deconvolution is carried out to high-efficient detection device power spectrum, it all can peak area to calculate it, and by all-round calculated by peak area nucleic level of activity, to solve the bottleneck problem of the prior art.
Description
Technical field
The invention belongs to nuclear radiation detection technical fields, and in particular to a kind of to be visited by high energy resolution and high detection efficient
Survey device constitute, can realize high energy resolution simultaneously, the gamma spectrum combined detection system of high detection efficient and gamma spectrum measure
Method.
Background technology
The existing gamma spectrum to nucleic measures, obtains nucleic type and the method for level of activity, is often made with
Nucleic detector obtains the gamma spectrum of nucleic, gamma-ray full energy peak peak position is read out later, according to full energy peak peak position to core
Plain type is identified, and reads out gamma-ray all-round peak area, according to all can peak area obtain the activity water of nucleic
It is flat, wherein nucleic type is identified according to full energy peak peak position, it is desirable that detector has high energy resolution, according to all-round
Peak area obtains the level of activity of nucleic, it is desirable that detector has higher detection efficient.The energy resolution of detector is higher,
γ nuclide identification abilities are stronger, and detection efficient is higher, and γ nucleic level of activity calculating is more accurate, is especially put for low-level
When the horizontal measurement of penetrating property, the two features are particularly important, if necessary to obtain accurate nucleic type and level of activity simultaneously, then
Need detector that not only there is high energy resolution, it is also necessary to have high detection efficient.
However the prior art has the following disadvantages：High energy resolution detector detection efficient itself is not high, is doing nucleic
When detection especially low-activity nucleic detects, detection efficient is even more to be extremely difficult to require, to make up this deficiency, at present
Method be improve high energy resolution detector itself efficiency, or extend detection time, however, due to high energy resolution
Rate detector cost is generally higher, and it is even more that cost can be significantly increased to improve its own detection efficient；By extending detection time not
But detection cost can be increased, and do not allow for detecting for a long time in many occasions, both modes all have larger lack at present
It falls into, cannot be satisfied the needs of the nucleic detection of the detection of radionuclide gamma spectrum, especially low-activity.
So provide it is a kind of not only with high energy resolution but also the detection system with high detection efficient and measurement method,
It is of great significance for gamma spectrum measurement.
Invention content
For problems of the prior art, the present invention provides a kind of not only with high energy resolution but also with height
The gamma spectrum detection system of detection efficient, the system is by carrying out high energy resolution detector and high detection efficient detector
Combination need not use high cost or extend the counting that time of measuring improves high energy resolution detector, just can reach simultaneously
High energy resolution and the gamma spectrum of high detection efficient measure.The present invention also provides application, the system carries out gamma spectrum measurement
Method, this method need not read all-round peak area by high energy resolution detector, but be detected with high energy resolution
On the basis of the nucleic peak position of device, deconvolution is carried out to high-efficient detection device power spectrum, to calculate its all can peak area, and pass through
All-round calculated by peak area nucleic level of activity, to solve problem of the prior art.
The present invention is achieved by the following technical solutions：
A kind of gamma spectrum combined detection system, including high energy resolution detector, high detection efficient detector, data are adopted
Collect processing module, communication module, host computer, the high energy resolution detector, high detection efficient detector respectively with number
It is connected according to acquisition processing module, is connected by communication module between digital sampling and processing and host computer；Or：Described
Digital sampling and processing is mounted in host computer, the high energy resolution detector, high detection efficient detector difference
It is connected with communication module, communication module is connected with host computer, passes through the digital sampling and processing in host computer
Carry out the acquisition and processing of data.
Further, the high detection efficient detector is one or more.
Further, the high energy resolution detector, high detection efficient detector pass through the first analog-digital converter
ADC, the second analog-digital converter ADC are connected with digital sampling and processing or communication module.
A kind of gamma spectrum measurement method of application gamma spectrum combined detection system as described above, includes the following steps：
(1) the energy measurement range for adjusting each each probe of detector in the gamma spectrum combined detection system, makes
Each detector energy measurement range reaches unanimity；
(2) when the detectable signal of each detector in the gamma spectrum combined detection system enters data acquisition process mould
After block, the nucleic peak position of high energy resolution detector is read, and reads the energy calibration of each detector as a result, according to energy
Calibration results are merged, and high efficiency gamma-spectrometric data is obtained；
(3) on the basis of the nucleic peak position of the high energy resolution detector measurement read in step (2), to step
(2) the high efficiency gamma-spectrometric data that fusion obtains in carries out deconvolution using detector response matrix, obtains high detection efficient detection
The all-round peak area of the gamma spectrum of device；
(4) by the gamma spectrum of high detection efficient detector all can peak area obtain the level of activity of nucleic.
Further, after the step (4), according to the high efficiency gamma-spectrometric data described in step (2), pass through G
Function is converted, and the dosage rate values of dosage rate and the contribution of each nucleic are obtained.
Further, the G-function is converted to：
If the form of power spectrum is N (E), total gamma-rays dosage D can correspond to the metering D of energy gamma-rays generation with each roadi
Add up and acquire, i.e.,：
N indicates power spectrum road number, N (Ei) expression energy be EiRoad location corresponding to counting, G (Ei) indicate that road location institute is right
The G-function weighted value answered；The weighted value of G-function is calculated using least square method；By the detector response function in step (3)
Matrix is multiplied with G-function obtains the dosage rate of a certain nucleic contribution.
Further, it is adjusted to by way of adjusting high pressure and gain-adjusted described in step (1).
Further, it is fused to be added by the corresponding road location counting of energy calibration described in step (2).
Further, the method for the all-round peak area of the gamma spectrum for obtaining high detection efficient detector described in step (3)
For：
The power spectrum M (E) of detector measurement can use following formulae express：
T(E0) it is the gamma-ray true energy distribution that radioactive source discharges, R (E, E0) be detector receptance function, E0For
Incident energy of γ ray, ε are random electronic noise；
Above formula can be indicated with matrix-style：
In fact, it is difficult to which electronic noise receptance function is separated, institute's above formula can be expressed as：
R'(E,E0) it is detector response function matrix；
After structure completes detector response function matrix, deconvolution is carried out：Above-mentioned equation solution process is calculated using iteration
The practical former spectrum of method Approach by inchmeal, iterative algorithm use EM algorithms；
EM algorithm iteration formula：
Be added relaxation factor, obtain all can peak area be：
Wherein A=R'(E, E0), X=T (E0), B=M (E).
The present invention has the following technical effects：By the way that high energy resolution detector and high detection efficient detector are carried out
Combination, and on the basis of the peak position of high energy resolution detector, deconvolution is carried out to high-efficient detection device power spectrum, to obtain
Its all can peak area, and by all can peak area obtain nucleic level of activity, to solve problem of the prior art, do not need
The detection efficient that high energy resolution detector is improved using high cost, in the premise of rational cost and shorter time of measuring
Under, it realizes while high energy resolution can be reached and technology that high detection efficient measures radionuclide gamma spectrum
Effect.
Description of the drawings
Fig. 1 is gamma spectrum combined detection system schematic；
In figure：1- radioactive sources, 2- high energy resolution detectors, 3- the first digital analog converter ADC, 4- high detection efficients are visited
Survey device, 5- the second digital analog converter ADC, 6- digital sampling and processings, 7- communication modules, 8- host computers.
Specific embodiment
This part will the present invention will be further explained in conjunction with the accompanying drawings and embodiments with explanation：
Embodiment 1
As shown in Figure 1, a kind of gamma spectrum combined detection system, including high energy resolution detector 2, high detection efficient are visited
Survey device 4, digital sampling and processing 6, communication module 7, host computer 8, the high energy resolution detector 2, high detection effect
Rate detector 4 is connected by the first analog-digital converter ADC3, the second analog-digital converter ADC5 with digital sampling and processing 6 respectively
It connects, is connected by communication module 7 between digital sampling and processing 6 and host computer 8.
Communication module provides network, RS232,485 interfaces, can also use other communication interfaces in the prior art.
In order to improve all-round peak area counts rate, the high detection efficient detector 4 is multiple in the present embodiment.
The method for carrying out gamma spectrum measurement using the system, includes the following steps：
(1) the energy measurement range for adjusting each probe of detector, makes each detector regimes reach unanimity；
Specially：By the high energy resolution detector and the high detection effect of one or more in gamma spectrum combined detection system
The energy measurement range of the probe of rate detector is adjusted so that each detector by adjusting high pressure and gain-adjusted
Range reaches unanimity, and described reaching unanimity refers to using existing feasible all methods so that measurement range as much as possible one
It causes, after adjustment, is more advantageous to the synthesis of next step detector power spectrum.
(2) after the detectable signal of each detector of gamma spectrum combined detection system enters data processing module, according to energy
Calibration results are merged；
Specially：Start detector, obtain detectable signal, detectable signal includes：The high-energy point in this system is used respectively
The gamma spectrum that resolution detector and high detection efficient detector detect.Detectable signal enters data processing module, data
Processing module reads the nucleic peak position in the gamma spectrum that high energy resolution detector detects, and to multiple high detection efficients
The gamma spectrum that detector, high energy resolution detector detect, is merged according to energy calibration result, and energy calibration is logical
Crossing after data processing module is handled can directly obtain, and fusion method counts phase specifically by the corresponding road location of energy calibration
Add.The purpose of fusion is to count multiple spectrums to be all added in a power spectrum, i.e., detection efficient is cumulative, cumulative by merging
Obtain high efficiency gamma-spectrometric data.
In above-mentioned data processing module, for reading detectable signal, reading the ginsengs such as nucleic peak position and energy calibration
Several software can use existing any technology that disclosure satisfy that requirement, such as Altek Company Gammavision32, Canberra
The Genius 2000 of company.
(3) since the detector response function matrix corresponding to different-energy is different, it can be calculated according to nucleic peak position
Corresponding detector response function matrix, therefore, the nucleic peak position obtained with high energy resolution detector measurement in step (2)
On the basis of, deconvolution calculating is carried out to the high efficiency gamma-spectrometric data obtained after merging and adding up in step (2), obtains high efficiency
The all-round peak area of detector gamma spectrum；
Detailed process is as follows：
The power spectrum M (E) of detector measurement can use following formulae express：
T(E0) it is the gamma-ray true energy distribution that radioactive source discharges, R (E, E0) be detector receptance function, E0For
Incident energy of γ ray, ε are random electronic noise.
Above formula can be indicated with matrix-style：
In fact, it is difficult to which electronic noise receptance function is separated, institute's above formula can be expressed as：
R'(E,E0) it is detector response function matrix.
After structure completes detector response function matrix, deconvolution is carried out：Above-mentioned equation solution process is calculated using iteration
Method Approach by inchmeal actual spectrum, iterative algorithm use EM algorithms.
EM algorithm iteration formula：
Be added relaxation factor, obtain all can peak area be：
Wherein A=R'(E, E0), X=T (E0), B=M (E).
(4) pass through the level of activity of the all-round calculated by peak area measurement object of high-efficient detection device gamma spectrum.Calculation is adopted
With existing any feasible spectrum unscrambling mode.
(5) according to by merging the high efficiency gamma-spectrometric data for adding up and obtaining, passing through can Spectrum Dose Conversion Operator letter in step (2)
Number, i.e. G-function are converted, and the dosage rate values of dosage rate and the contribution of each nucleic are obtained.Specially：
If the form of power spectrum is N (E), total gamma-rays dosage D can correspond to the metering D of energy gamma-rays generation with each roadi
Add up and acquire, i.e.,：
N indicates power spectrum road number, N (Ei) expression energy be EiRoad location corresponding to counting, G (Ei) indicate that road location institute is right
The G-function weighted value answered.
The weighted value of G-function is calculated using least square method.
It is multiplied with G-function and area by the response matrix of a certain nucleic in the detector response function matrix in step (3)
Obtain the dosage rate of a certain nucleic contribution.
Embodiment 2
The present embodiment compared with Example 1, the difference is that：A kind of gamma spectrum combined detection system, including high-energy
Resolution detector 2, high detection efficient detector 4, digital sampling and processing 6, communication module 7, host computer 8, the number
It is mounted in host computer 8 according to processing module 6, the high energy resolution detector 2, high detection efficient detector 4 lead to respectively
Cross the first analog-digital converter ADC3, the second analog-digital converter ADC5 is connected with communication module 7, communication module 7 and 8 phase of host computer
Connection carries out the acquisition and processing of data by the digital sampling and processing 6 in host computer 8.
Claims (9)
1. a kind of gamma spectrum combined detection system, including：High energy resolution detector (2), high detection efficient detector (4),
Digital sampling and processing (6), communication module (7), host computer (8), the high energy resolution detector (2), high detection
Efficiency detector (4) is connected with digital sampling and processing (6) respectively, digital sampling and processing (6) and host computer (8) it
Between be connected by communication module (7)；Or：The digital sampling and processing (6) is mounted in host computer (8), described
High energy resolution detector (2), high detection efficient detector (4) are connected with communication module (7) respectively, communication module (7)
Be connected with host computer (8), by the digital sampling and processing (6) that is mounted in host computer (8) carry out data acquisition and
Processing.
2. a kind of gamma spectrum combined detection system as described in claim 1, it is characterised in that：The high detection efficient detection
Device (4) is one or more.
3. a kind of gamma spectrum combined detection system as claimed in claim 1 or 2, it is characterised in that：The high energy resolution
Rate detector (2), high detection efficient detector (4) pass through the first analog-digital converter ADC (3), the second analog-digital converter ADC (5)
It is connected with digital sampling and processing (6) or communication module (7).
4. a kind of gamma spectrum measurement method using gamma spectrum combined detection system as described in any one of claims 1-3, special
Sign is：Include the following steps：
(1) the energy measurement range for adjusting each each probe of detector in the gamma spectrum combined detection system, makes each
Detector energy measurement range reaches unanimity；
(2) when the detectable signal of each detector in the gamma spectrum combined detection system enters digital sampling and processing
Afterwards, the nucleic peak position of high energy resolution detector is read, and reads the energy calibration of each detector as a result, being carved according to energy
Degree result is merged, and high efficiency gamma-spectrometric data is obtained；
(3) on the basis of the nucleic peak position of the high energy resolution detector measurement read in step (2), in step (2)
It merges obtained high efficiency gamma-spectrometric data and deconvolution is carried out using detector response matrix, obtain the γ of high detection efficient detector
The all-round peak area of power spectrum；
(4) by the gamma spectrum of high detection efficient detector all can peak area obtain the level of activity of nucleic.
5. gamma spectrum measurement method as claimed in claim 4, it is characterised in that：After the step (4), according to step
(2) the high efficiency gamma-spectrometric data described in, is converted by G-function, obtains the dosage rate values of dosage rate and the contribution of each nucleic.
6. gamma spectrum measurement method as claimed in claim 5, it is characterised in that：The G-function is converted to：
If the form of power spectrum is N (E), total gamma-rays dosage D can correspond to the metering D of energy gamma-rays generation with each roadiTired out
Add and acquire, i.e.,：
N indicates power spectrum road number, N (Ei) expression energy be EiRoad location corresponding to counting, G (Ei) indicate G corresponding to the road location
Function weighted value；The weighted value of G-function is calculated using least square method；By the detector response function matrix in step (3)
It is multiplied with G-function and obtains the dosage rate of a certain nucleic contribution.
7. the gamma spectrum measurement method as described in claim 4 or 5 or 6, it is characterised in that：It is adjusted to described in step (1)
By way of adjusting high pressure and gain-adjusted.
8. the gamma spectrum measurement method as described in claim 4 or 5 or 6, it is characterised in that：It is fused to described in step (2)
It is counted and is added by the corresponding road location of energy calibration.
9. the gamma spectrum measurement method as described in claim 4 or 5 or 6, it is characterised in that：Height is obtained described in step (3)
The gamma spectrum of detection efficient detector all can the method for peak area be：
The power spectrum M (E) of detector measurement can use following formulae express：
T(E0) it is the gamma-ray true energy distribution that radioactive source discharges, R (E, E0) be detector receptance function, E0For incidence
Energy of γ ray, ε be random electronic noise；
Above formula can be indicated with matrix-style：
In fact, it is difficult to which electronic noise receptance function is separated, institute's above formula can be expressed as：
R'(E,E0) it is detector response function matrix；
After structure completes detector response function matrix, deconvolution is carried out：By above-mentioned equation solution process using iterative algorithm by
Secondary to approach practical original spectrum, iterative algorithm uses EM algorithms；
EM algorithm iteration formula：
Be added relaxation factor, obtain all can peak area be：
Wherein A=R'(E, E0), X=T (E0), B=M (E).
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| CN111579571A (en) * | 2020-06-02 | 2020-08-25 | 中国工程物理研究院核物理与化学研究所 | Method for gradually approaching scale gamma energy spectrum high-energy region based on peak shape fitting |
| CN111579571B (en) * | 2020-06-02 | 2022-11-25 | 中国工程物理研究院核物理与化学研究所 | Method for gradually approaching scale gamma energy spectrum high-energy region based on peak shape fitting |
| CN112882082A (en) * | 2021-01-12 | 2021-06-01 | 中国人民解放军海军工程大学 | Neutron-gamma ambient dose equivalent rate instrument based on pulse shape discrimination |
| CN116009055A (en) * | 2023-02-17 | 2023-04-25 | 西安中核核仪器股份有限公司 | Method for quickly acquiring full energy response matrix |
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