CN113376678A - High-speed high-precision radionuclide 4 pi beta-gamma coincidence measuring instrument - Google Patents
High-speed high-precision radionuclide 4 pi beta-gamma coincidence measuring instrument Download PDFInfo
- Publication number
- CN113376678A CN113376678A CN202110666884.4A CN202110666884A CN113376678A CN 113376678 A CN113376678 A CN 113376678A CN 202110666884 A CN202110666884 A CN 202110666884A CN 113376678 A CN113376678 A CN 113376678A
- Authority
- CN
- China
- Prior art keywords
- module
- time
- acquisition
- coincidence
- mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000012937 correction Methods 0.000 claims abstract description 14
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 238000001228 spectrum Methods 0.000 claims description 45
- 238000012545 processing Methods 0.000 claims description 29
- 238000004364 calculation method Methods 0.000 claims description 22
- 230000009467 reduction Effects 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 17
- 230000000694 effects Effects 0.000 claims description 17
- 238000013213 extrapolation Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 11
- 230000002285 radioactive effect Effects 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000004422 calculation algorithm Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims 1
- 238000009795 derivation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- G01T1/20—Measuring radiation intensity with scintillation detectors
-
- 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
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/208—Circuits specially adapted for scintillation detectors, e.g. for the photo-multiplier section
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
- G01T1/362—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry with scintillation detectors
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Measurement Of Radiation (AREA)
- Nuclear Medicine (AREA)
Abstract
The invention discloses a high-speed high-precision radionuclide 4 pi beta-gamma coincidence measuring instrument which is characterized by comprising a digitizer and upper computer software; the upper computer software comprises an acquisition control module and calculation software, and the acquisition control module is connected with the digitizer and the calculation software; the digitizer includes: and a high-speed acquisition module. The measuring instrument can meet the sampling requirements of output signals of most detectors in application scenes, and the pulse information output by the detectors is reserved to the maximum extent; pulse signals can be screened from the collected signals according to the specific noise characteristics of the device; an active time based count correction method was developed. The method is not limited to the selection of the active time mode of the system, and can also be conveniently expanded to the situation of considering out of channels, so that the method is free from the complicated derivation of correction formulas under different situations.
Description
Technical Field
The invention relates to a high-speed high-precision radionuclide 4 pi beta-gamma coincidence measuring instrument, belonging to the field of nuclear electronics and fast electronics.
Background
The main factors that have limited the accuracy of the calculation of a 4 Π β - γ measurement system have been three for a long time: firstly, the data acquisition sampling rate is limited, secondly, the environment of a radioactive source conforms to the interference of electronics noise, thirdly, the deduction of a counting correction formula is complex and the application range is limited. Aiming at the three problems, the invention provides a high-speed data digitizer with digital noise reduction and digital coincidence calculation software based on an active time method.
Disclosure of Invention
The invention aims to provide a high-speed high-precision radionuclide 4 pi beta-gamma coincidence measuring instrument, and establish a set of high-speed high-precision radionuclide absolute activity measuring system. The invention aims to solve the technical problem of establishing a set of high-speed and high-precision measuring device for measuring the absolute activity of the radioactive source, and the precision of the absolute activity measurement of the radioactive source is well improved by solving a series of core technical problems. The invention mainly relates to high-speed acquisition, signal processing, transmission, coincidence calculation and the like of a radionuclide fast signal. The acquisition system adopts the technical scheme of off-line coincidence calculation, namely, nuclear pulse signals of a detector are acquired through a high-speed ADC (analog to digital converter), energy and time information of the signals are extracted by using an FPGA (field programmable gate array) real-time signal processing method, and then data are transmitted to digital coincidence software of an upper computer through a high-speed interface. In the upper computer, delay time and coincidence resolution time are obtained through a delay time spectrum, coincidence calculation, counting correction and fitting extrapolation are performed by software, and an absolute activity value of nuclides is given.
The invention adopts the following technical scheme:
a high-speed high-precision radionuclide 4 Π beta-gamma coincidence measuring instrument comprises a digitizer and upper computer software, wherein the upper computer software comprises an acquisition control module and calculation software, and the acquisition control module is connected with the digitizer and the calculation software. The digitizer includes: the device comprises a high-speed acquisition module and a data processing module.
And the high-speed acquisition module comprises an anti-aliasing circuit and a high-speed ADC and is used for acquiring output signals of front-end electronics, the sampling rate is up to 1Gsps, and the sampling depth can reach 14 bits. The high-speed acquisition module can meet the sampling rate requirements of most scintillation detectors in application scenes.
The data processing module mainly comprises the following modules:
and the noise reduction module is used for screening and removing noise signals in the acquired pulse signals by using a power spectrum estimation method. In actual measurement, before formal measurement, the system needs to collect a section of noise signal, and estimate the noise power spectrum of the collection device. The noise power spectrum parameters are then passed into a noise reduction module for noise discrimination. The module algorithm is realized in commercial DSP by c language.
And the digital signal processing module is used for pulse forming and pulse information extraction. This module is implemented in a commercially available FPGA by a hardware description language.
And the high-speed data transmission module is used for uploading the original pulse signal or the energy and time information of the pulse to the calculation software. The invention uses the USB3.0 protocol to transmit data.
And the upper computer software is written and finished on the windows operating system by C # language. The system mainly comprises an acquisition control module and calculation software:
the acquisition control module is used for controlling command streams and data streams of the whole system and mainly comprises the configuration of a working mode of a digitizer, the parameter calculation and transmission of a noise reduction module, the enabling and resetting of acquisition, the parameter configuration of a digital signal processing module, an acquisition channel threshold value, a sampling rate and the like. The acquisition control module is a link for connecting the digitizer and the computing software.
The computing software mainly comprises the following modules:
and the power spectrum calculation module is used for estimating a power spectrum according to the acquired pulse signals and generating a configuration file of the noise reduction module.
And the energy spectrum drawing module is used for generating an energy spectrum, a time interval spectrum, a delay time spectrum between channels and a coincidence energy spectrum of each channel according to the acquired pulse signals of each channel. The energy spectrum is used to observe the pulse energy characteristics and to acquire the data quality. The delay time spectrum is used to calculate the inter-channel delay time and coincidence resolving time.
The dead time processing module is used for manually adding a determined dead time value on the pulse to cover the dead time of the system, and the software realizes two dead time modes of fixing the dead time and expanding the dead time.
And the digital coincidence module is used for calculating the coincidence count. The module outputs coincidence counts and gives dead time of the coincidence tracks while the coincidence counts are inverted based on the live time method.
And the counting correction module is used for correcting the dead time of counting and correcting accidental coincidence. The invention provides a counting correction method based on the live time, which is applicable to both fixed dead time and expanded dead time modes of a system and can be expanded to the condition of considering out off channel effect.
And the activity calculation module is used for giving the absolute activity value of the radioactive source by using a fitting extrapolation method. The invention develops an extrapolation covariance matrix calculation method given by smith, solves the problem of data correlation in the extrapolation process by a weighted fitting method, and obtains an absolute activity value with smaller extrapolation uncertainty.
In order to meet the actual test requirements, the digitizer can be configured into three working modes by upper computer software: a pre-acquisition mode, a real-time mode and a non-real-time mode.
A pre-acquisition mode: and directly transmitting the pulse waveform after the threshold value is exceeded to an upper computer, wherein the required transmission rate is too high, so that the acquired data is firstly cached in a memory of the digitizer, and the acquired data is uploaded to upper computer software for analysis after the acquisition is finished. This mode has two roles: firstly, noise is collected to determine the parameters of the noise reduction module, and secondly, pulse waveforms are analyzed under a zero threshold value to determine the required parameters of collection and digital signal processing. The pre-acquisition mode is a preparation link before formal acquisition.
The acquisition modes are further classified into a non-real-time mode and a real-time mode. In the real-time mode, in order to reduce the transmission rate of data, only the time information and the amplitude information of the acquisition pulse are uploaded, so that real-time acquisition and transmission can be realized. And the non-real-time mode acquires and uploads the complete waveform subjected to noise reduction and pulse forming, and a mode of caching firstly and then uploading off line is adopted.
The advantages and positive effects are as follows:
(1) by adopting the high-speed high-performance ADC, the sampling requirements of output signals of most detectors in application scenes can be met, and pulse information output by the detectors is reserved to the maximum extent.
(2) Pulse signals can be screened from the acquired signals according to the specific noise characteristics of the device by a power spectrum estimation method.
(3) An active time based count correction method was developed. The method is not limited to the selection of the active time mode of the system, and can also be conveniently expanded to the situation of considering out of channels, so that the method is free from the complicated derivation of correction formulas under different situations.
Through the covariance matrix and the weighted extrapolation method, the uncertainty of the extrapolation result is reduced. The actual measurement result shows that the measurement of the set of coincidence measuring instrument is uncertain within 0.3 percent.
Drawings
FIG. 1 is a schematic diagram of digitizer hardware;
FIG. 2 is a schematic diagram of the FPGA + DSP logic structure;
FIG. 3 is a block diagram of computing software.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments. The following examples are only for explaining the present invention, the scope of the present invention shall include the full contents of the claims, and the full contents of the claims of the present invention can be fully realized by those skilled in the art through the following examples.
Fig. 1 and 2 show the hardware composition and logical structure of the measurement system, respectively. A measuring person can send a configuration command and a state command to the digitizer by using the usb3.0 interface through the upper computer acquisition control module, so that the digitizer works in a proper working mode. FIG. 3 is a block diagram of computing software with waveform data input to the acquisition control module for determining operational parameters of the digitizer. The pulse information is input into a coincidence calculation module for calculating an absolute activity value of the radiation source.
A high-speed high-precision radionuclide 4 pi beta-gamma coincidence measuring instrument comprises a complete set of solution including a digitizer and upper computer software; the upper computer software comprises an acquisition control module and calculation software, and the acquisition control module is connected with the digitizer and the calculation software; the digitizer includes: the device comprises a high-speed acquisition module and a data processing module.
Referring to fig. 1-2, a digitizer includes a high speed acquisition module and a data processing module. And the high-speed acquisition module comprises an anti-aliasing circuit and a high-speed commercial ADC and is used for acquiring output signals of front-end electronics, the sampling rate is up to 1Gsps, and the sampling depth can reach 14 bits. The high-speed acquisition module can meet the sampling rate requirements of most scintillation detectors in application scenes.
The data processing module mainly comprises the following modules: the device comprises a noise reduction module, a digital signal processing module and a high-speed data transmission module.
And the noise reduction module is used for screening and removing noise signals in the acquired pulse signals by using a power spectrum estimation method. In actual measurement, before formal measurement, the system needs to collect a section of noise signal, and estimate the noise power spectrum of the collection device. The noise power spectrum parameters are then passed into a noise reduction module for noise discrimination. The module algorithm is realized in commercial DSP by c language.
And the digital signal processing module is used for pulse forming and pulse information extraction. This module is implemented in a commercially available FPGA by a hardware description language.
And the high-speed data transmission module is used for uploading the original pulse signal or the energy and time information of the pulse to the calculation software. The invention uses the USB3.0 protocol to transmit data.
And the upper computer software is written and finished on the windows operating system by C # language. Mainly comprises an acquisition control module and calculation software, as shown in fig. 3:
the acquisition control module is used for controlling command streams and data streams of the whole system and mainly comprises the configuration of a working mode of a digitizer, the parameter calculation and transmission of a noise reduction module, the enabling and resetting of acquisition, the parameter configuration of a digital signal processing module, an acquisition channel threshold value, a sampling rate and the like. The acquisition control module is a link for connecting the digitizer and the computing software.
The computing software mainly comprises the following modules:
and the power spectrum calculation module is used for estimating a power spectrum according to the acquired pulse signals and generating a configuration file of the noise reduction module.
And the energy spectrum drawing module is used for generating an energy spectrum, a time interval spectrum, a delay time spectrum between channels and a coincidence energy spectrum of each channel according to the acquired pulse signals of each channel. The energy spectrum is used to observe the pulse energy characteristics and to acquire the data quality. The delay time spectrum is used to calculate the inter-channel delay time and coincidence resolving time.
The dead time processing module is used for manually adding a determined dead time value on the pulse to cover the dead time of the system, and the software realizes two dead time modes of fixing the dead time and expanding the dead time.
And the digital coincidence module is used for calculating the coincidence count. The module outputs coincidence counts and gives dead time of the coincidence tracks while the coincidence counts are inverted based on the live time method.
And the counting correction module is used for correcting the dead time of counting and correcting accidental coincidence. The invention provides a counting correction method based on the live time, which is applicable to both fixed dead time and expanded dead time modes of a system and can be expanded to the condition of considering out off channel effect.
And the activity calculation module comprises two parts of covariance calculation and fitting extrapolation. The invention provides the absolute activity value of the radioactive source by using a fitting extrapolation method. The invention develops an extrapolation covariance matrix calculation method given by smith, solves the problem of data correlation in the extrapolation process by a weighted fitting method, and obtains an absolute activity value with smaller extrapolation uncertainty.
In order to meet the actual test requirements, the digitizer can be configured into three working modes by upper computer software: a pre-acquisition mode, a real-time mode and a non-real-time mode.
A pre-acquisition mode: and directly transmitting the pulse waveform after the threshold value is exceeded to an upper computer, wherein the required transmission rate is too high, so that the acquired data is firstly cached in a memory of the digitizer, and the acquired data is uploaded to upper computer software for analysis after the acquisition is finished. This mode has two roles: firstly, noise is collected to determine the parameters of the noise reduction module, and secondly, pulse waveforms are analyzed under a zero threshold value to determine the required parameters of collection and digital signal processing. The pre-acquisition mode is a preparation link before formal acquisition.
The acquisition modes are further classified into a non-real-time mode and a real-time mode. In the real-time mode, in order to reduce the transmission rate of data, only the time information and the amplitude information of the acquisition pulse are uploaded, so that real-time acquisition and transmission can be realized. And the non-real-time mode acquires and uploads the complete waveform subjected to noise reduction and pulse forming, and a mode of caching firstly and then uploading off line is adopted.
The general operational flow of the present meter is as follows.
The laboratory technician firstly prepares a radioactive source sample to be detected and a corresponding reference background, places the radioactive source sample in a detection device, and connects a pulse signal with a digitizer through an MUX interface after the detector outputs a signal. And then, configuring the digitizer into a pre-acquisition mode by an experimenter through an acquisition control module of the upper computer, setting an acquisition threshold value to be 0, and then starting an acquisition command.
The laboratory technician calculates the digital signal processing parameters and the acquisition threshold according to the acquired data, then replaces the radioactive source sample in the detection device with the background, acquires noise in a pre-acquisition mode, and calculates the power spectrum of the noise. And the experimenter generates a corresponding noise discrimination configuration file according to the noise power spectrum, and writes the file into the DSP chip. Thus, the pre-collection work is completed.
The laboratory technician replaces the radioactive source sample in the detection device, configures the digitizer into a real-time processing mode or an off-line processing mode, and starts a collection command. The two acquisition modes have respective advantages and disadvantages. In the off-line processing mode, the acquisition time length is determined by the memory size of the digitizer, and the obtained pulse waveform can be calculated in the coincidence calculation software only after the time and energy information is extracted, but the off-line processing mode keeps the complete waveform after the pulse forming. The real-time processing mode can realize long-time acquisition and can directly obtain pulse information, but the mode only reserves the time and energy information of the pulse.
The experimenter enters the pulse information into the calculation software. The pulse information sequentially passes through the dead time processing module, the coincidence calculation module, the counting correction module and the fitting extrapolation module, and finally the absolute activity value of the nuclide is calculated. The energy spectrum drawing module and the covariance calculation module are auxiliary modules and are respectively used for generating an energy spectrum, a delay time spectrum and a calculation covariance matrix.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A high-speed high-precision radionuclide 4 Π beta-gamma coincidence measuring instrument is characterized by comprising a digitizer and upper computer software; the upper computer software comprises an acquisition control module and calculation software, and the acquisition control module is connected with the digitizer and the calculation software; the digitizer includes: the device comprises a high-speed acquisition module and a data processing module.
2. The surveying instrument according to claim 1, wherein the high-speed acquisition module comprises an anti-aliasing circuit and a high-speed high-precision ADC for acquiring an output signal of front-end electronics.
3. The surveying instrument according to claim 1, wherein the data processing module comprises a noise reduction module, a digital signal processing module and a high speed data transmission module.
4. The measuring instrument according to claim 3, wherein the noise reduction module discriminates and removes noise signals from the collected pulse signals by using a power spectrum estimation method; during actual measurement, before formal measurement, the system needs to collect a section of noise signal, and estimate the noise power spectrum of the collection device; the noise power spectrum parameters are then transmitted into a noise reduction module for noise discrimination; the module algorithm is realized in commercial DSP by c language.
5. The surveying instrument according to claim 3, wherein the digital signal processing module is configured to perform pulse shaping and pulse information extraction; this module is implemented in an FPGA by a hardware description language.
6. The measuring instrument according to claim 3, wherein the high-speed data transmission module is used for uploading original pulse signals or energy and time information of the pulses to the calculation software; data is transmitted using the USB3.0 protocol.
7. The gauge as claimed in claim 1, wherein the upper computer software is written in windows operating system in C # language.
8. The surveying instrument according to claim 1, wherein the acquisition control module is configured to control command stream and data stream of the whole system, including digitizer operation mode configuration, noise reduction module parameter calculation and transmission, enabling and resetting acquisition, parameter configuration of digital signal processing module, acquisition channel threshold, and sampling rate.
9. The surveying instrument according to claim 1, characterized in that the computing software essentially comprises the following modules: the device comprises a power spectrum calculation module, an energy spectrum drawing module, a dead time processing module, a digital coincidence module, a counting correction module and an activity calculation module; preferably, the power spectrum calculation module performs power spectrum estimation according to the acquired pulse signal and generates a configuration file of the noise reduction module; preferably, the energy spectrum drawing module generates an energy spectrum of each channel, a time interval spectrum, a delay time spectrum between channels and a coincidence energy spectrum according to the acquired pulse signals of each channel, wherein the energy spectrum is used for observing pulse energy characteristics and acquiring data quality, and the delay time spectrum is used for calculating delay time between channels and coincidence resolution time; preferably, the dead time processing module is configured to manually add a determined dead time value to the pulse to cover dead time of the system itself, and the software implements two dead time modes, namely fixed dead time and expanded dead time; preferably, the digital coincidence module is used for calculating a coincidence count, and the module outputs the coincidence count and gives the dead time of the coincidence track while outputting the coincidence count and counting back on the basis of an active time method; preferably, the counting correction module is used for correcting the dead time of counting and accidental coincidence, and is a counting correction method based on the live time, and the method is suitable for both fixed dead time and expanded dead time of a system; preferably, the activity calculation module gives the absolute activity value of the radioactive source by using a fitting extrapolation method.
10. The surveying instrument according to claim 1, characterized in that the digitizer is configured by the upper computer software in three modes of operation: a pre-acquisition mode, a real-time mode and a non-real-time mode;
a pre-acquisition mode: the acquired data is firstly cached in the memory of the digitizer, and then uploaded to the upper computer software for analysis after the acquisition is finished, wherein the pre-acquisition mode is a preparation link before formal acquisition;
the acquisition mode is divided into a non-real-time mode and a real-time mode: in the real-time mode, in order to reduce the transmission rate of data, only the time information and the amplitude information of the acquisition pulse are uploaded, so that real-time acquisition and transmission can be realized; and the non-real-time mode acquires and uploads the complete waveform subjected to noise reduction and pulse forming, and a mode of caching firstly and then uploading off line is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110666884.4A CN113376678A (en) | 2021-06-16 | 2021-06-16 | High-speed high-precision radionuclide 4 pi beta-gamma coincidence measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110666884.4A CN113376678A (en) | 2021-06-16 | 2021-06-16 | High-speed high-precision radionuclide 4 pi beta-gamma coincidence measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113376678A true CN113376678A (en) | 2021-09-10 |
Family
ID=77574651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110666884.4A Pending CN113376678A (en) | 2021-06-16 | 2021-06-16 | High-speed high-precision radionuclide 4 pi beta-gamma coincidence measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113376678A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003057354A (en) * | 2001-08-13 | 2003-02-26 | Mitsubishi Electric Corp | Radiation monitor |
| JP2012013611A (en) * | 2010-07-02 | 2012-01-19 | Mitsubishi Electric Corp | Radiation monitor device |
| CN109839656A (en) * | 2019-02-22 | 2019-06-04 | 成都理工大学 | A kind of digital anticoincidence HPGe spectrometer system read based on α particle event |
| CN111413725A (en) * | 2020-03-27 | 2020-07-14 | 南华大学 | System and method for realizing gamma-gamma digital coincidence measurement by using virtual instrument technology |
-
2021
- 2021-06-16 CN CN202110666884.4A patent/CN113376678A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003057354A (en) * | 2001-08-13 | 2003-02-26 | Mitsubishi Electric Corp | Radiation monitor |
| JP2012013611A (en) * | 2010-07-02 | 2012-01-19 | Mitsubishi Electric Corp | Radiation monitor device |
| CN109839656A (en) * | 2019-02-22 | 2019-06-04 | 成都理工大学 | A kind of digital anticoincidence HPGe spectrometer system read based on α particle event |
| CN111413725A (en) * | 2020-03-27 | 2020-07-14 | 南华大学 | System and method for realizing gamma-gamma digital coincidence measurement by using virtual instrument technology |
Non-Patent Citations (3)
| Title |
|---|
| DING, ZG，等: "A Calculation Software for 4 pi beta-gamma Coincidence Counting", 《IEEE TRANSACTIONS ON NUCLEAR SCIENCE》 * |
| SAHIN, NK，等: "Development of a calculation software for 4 pi beta-gamma digital coincidence counting and its application to Co-60 and Eu-152 activity measurements", 《APPLIED RADIATION AND ISOTOPES》 * |
| 唐豪: "基于数字符合装置的60Co与54Mn活度绝对测量方法实验研究", 《中国优秀博硕士论文全文数据库（硕士） 工程科技Ⅱ辑》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105824817B (en) | A kind of digitizing solution of scintillation pulse | |
| JP5800983B2 (en) | Method and apparatus for scintillation pulse information acquisition | |
| CN104360376A (en) | Gamma camera having function of identifying radioactive source, namely nuclide, and nuclide identification method | |
| CN106596597B (en) | Radiation detector assembly, method and data processing method and processor | |
| WO2015010393A1 (en) | On-line energy coincidence method and system for all-digital pet system | |
| CN102353972B (en) | Multimode digital multichannel spectrometer | |
| CN103424766A (en) | Nuclide rapid identification method based on pattern recognition | |
| CN101666227A (en) | Method for acquiring natural gamma spectra | |
| CN102798846A (en) | Method for measuring parameters of secondary radar echo pulses | |
| CN108664425A (en) | A kind of data collecting system based on high speed analog-to-digital conversion and time-to-digital converter technology | |
| CN105842728A (en) | Pulse baseline estimation method in digital nuclear spectrum measurement system | |
| CN105141294B (en) | Double preset examination door-control type constant fraction discriminator discriminators and digital constant fraction discriminator discriminating method | |
| CN105425275A (en) | Anti-coincidence output discrimination system and anti-coincidence discrimination algorithm thereof | |
| CN106842277B (en) | Stacking event processing method and device | |
| CN103995147B (en) | A kind of Data Post Processing System being applicable to acoustic Doppler velocimetry and application | |
| CN104111482A (en) | Double-detector X-ray fluorescence logging probe tube and method | |
| CN104317214A (en) | Ultraviolet photon counting detector with position readout circuit | |
| CN111413725B (en) | System and method for realizing gamma-gamma digital coincidence measurement by using virtual instrument technology | |
| CN113376678A (en) | High-speed high-precision radionuclide 4 pi beta-gamma coincidence measuring instrument | |
| CN201600461U (en) | Multichannel pulse amplitude analyzer | |
| CN101464420A (en) | Portable high-speed multi-channel energy spectrometer | |
| CN102621170B (en) | Method for automatically determining measurement time in detection of energy spectrometer | |
| CN109507716A (en) | A method of obtaining scintillator detector energy information | |
| CN109633733B (en) | Digital anti-Compton energy spectrum measuring system adopting particle event reading mode | |
| CN104570039A (en) | Weak-radioactivity detection device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210910 |