CN104820231A - Detector for high temperature and high radiation environment radioactive nuclide analysis and measurement - Google Patents
Detector for high temperature and high radiation environment radioactive nuclide analysis and measurement Download PDFInfo
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- CN104820231A CN104820231A CN201510095805.3A CN201510095805A CN104820231A CN 104820231 A CN104820231 A CN 104820231A CN 201510095805 A CN201510095805 A CN 201510095805A CN 104820231 A CN104820231 A CN 104820231A
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Abstract
The present invention relates to the field of radiation measurement and nuclear electronics and provides a detector for high temperature and high radiation environment radioactive nuclide analysis and measurement. The detector comprises a main measurement probe for measuring a detected ray, a compensation probe for measuring an impurity ray in a measured ray surrounding environment and a pre-amplifier. The main measurement probe, the compensation probe and the pre-amplifier are subjected to far processing. According to the pre-amplifier, two paths of completely same pre-amplifier circuits are subjected to differential processing, one path is used for connecting the main measurement probe, and the other path is used for connecting the compensation probe. According to the detector, the remote collection of a weak pulse signal in a high temperature and high radiation environment, and the quantitative analysis and measurement problem of a radioactive nuclide in the high temperature and high radiation environment is solved at the same time.
Description
Technical field
The present invention relates to actinometry and nuclear electronics field, specifically a kind of detector for high temperature high radiation environment radioactive nuclide analysis to measure, be applicable to the radiation signal process in nuclear power station or nuclear logging, be specially adapted to the long-time online activity concentration of localized hyperthermia's height radiation and measure.
Background technology
At present for the detector mainly NaI(Tl of hot environment radioactive nuclide quantitative test measurement) scintillator detector.And under hot environment radioactivity measuring at most be in oil well logging, also nuclear power station steam generator radiomaterial leakage measuring instrumentation is had, this type of scintillator detector is integrated with probe by prime amplifier, additional heat-barrier material process simultaneously, is difficult to realize the long-time real-time online measuring of high temperature high radiation environment.External a few countries has also carried out certain research to hot environment radionuclide measurement, they adopt without prime amplifier process, directly measurement detector photomultiplier signal is out accessed main putting at a distance, avoid high temperature and high radiation environment on the impact of front electric discharge road semiconductor components and devices, realize high temperature high radiation environment and measure.This method due to signal to noise ratio (S/N ratio) very poor, only for count measurement, for the quantitative test of spectral pattern radioactive nuclide measuring still existing defects.
Summary of the invention
Object of the present invention is exactly to overcome above-mentioned weak point of the prior art, a kind of detector for high temperature high radiation environment radioactive nuclide analysis to measure is provided, successfully realize weak pulse signal remote capture under high temperature high radiation environment, under solving high temperature high radiation environment, a difficult problem is measured in long-time radioactive nuclide quantitative test simultaneously.
For achieving the above object, technical solution of the present invention is as follows: a kind of detector for high temperature high radiation environment radioactive nuclide analysis to measure, comprise the main measuring sonde for measuring tested ray, for measuring compensation probe and the prime amplifier of the impurity ray in tested ray surrounding environment, described main measuring sonde and compensation probe far put process with prime amplifier, described prime amplifier adopts the duplicate pre-amplification circuit of two-way to make difference processing, wherein a road is for connecting main measuring sonde, and another road compensates probe for connecting.
In technique scheme, described main measuring sonde is consistent with compensation sonde configuration, by the sodium iodide scintillator connected successively, glass light guides, photomultiplier composition.
In technique scheme, described prime amplifier and probe spacing are from >=30 meters.
In technique scheme, described prime amplifier is located at >=the thick lead shield box of 5cm in, described lead shield box liner 2mm stainless steel, described prime amplifier adopts double shield layer concentric cable to realize the long-distance transmissions of weak pulse signal.
In technique scheme, described pre-amplification circuit is by the charge integration sense amplifier, the passive filter circuit that connect successively and penetrate a grade follower and form.
The difficult problem that the present invention measures to solve the quantitative test of high temperature high radiation environment Hypertrophic Scar, have employed prime amplifier and the method process localized hyperthermia problem of far putting of popping one's head in, double-shielded cable process is adopted in signal long-distance transmissions process, adopt difference method to reduce the interference of environmental radiation to measurement result simultaneously, realize the measurement of the radioactive nuclide quantitative test of localized hyperthermia's environment real-time online.
Accompanying drawing explanation
Fig. 1 is prime amplifier difference channel schematic diagram of the present invention.
Fig. 2 is lead shield box inner structure schematic diagram of the present invention.
Wherein: 1. energy of γ ray deposition probe, 2. charge integration sense amplifier, 3. passive filter circuit, 4. penetrates a grade follower, 5. lead shield body, 6. signal wire screen layer, 7. coaxial shielding layer, 8. shielded signal line, 9. concentric cable, 10. stainless steel.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, 2, a kind of detector for high temperature high radiation environment radioactive nuclide analysis to measure that the present embodiment proposes, its probe and prime amplifier far put process, prime amplifier and probe spacing from >=30 meters, to reduce the impact of measurement point localized hyperthermia on prime amplifier components and parts; In order to ensure that the weak pulse signal of popping one's head in out is not disturbed in transmitting procedure, weaken, the present embodiment adopts double-layer coaxial cable to realize signal remote capture.
Because object environment radiation to be measured is stronger, in order to reduce environmental radiation, measurement result is affected, embodiment of the present invention prime amplifier have employed difference method, wherein a road pre-amplification circuit is for gathering main measuring sonde pulse signal, another road pre-amplification circuit and compensating is popped one's head in the miscount being connected and causing measuring sonde for deducting measuring sonde surrounding environment radioactivity, and interacts the magazine ray such as photoelectric effect, backscattering, Compton scattering that causes to measuring sonde miscount for deducting ray that object to be measured sends and measuring sonde ambient substance.Described main measuring sonde is consistent with compensation sonde configuration, all adopts energy of γ ray deposition probe, is made up of the sodium iodide scintillator connected successively, glass light guides, photomultiplier.
Because high radiation environment easily causes irradiation damage to front electric discharge road semiconductor components and devices, embodiment of the present invention pre-amplification circuit is additional >=the thick lead shield box of 5cm.In order to improve the accuracy of low energy region (30keV ~ 500keV) radionuclide measurement, lead shield box liner 2mm stainless steel is disturbed charge amplifier to shield external magnetic field.
Due to probe and spacing >=30 meter of prime amplifier, probe output unavoidably by space power frequency electromagnetic field and cable over the ground distributed capacitance affect, make signal introduce high frequency discrete noise, reduction signal to noise ratio (S/N ratio).For this reason, pre-amplification circuit after one-level charge integration amplifies, adopts RC low-pass filtering to improve signal to noise ratio (S/N ratio) by the embodiment of the present invention.Distant in view of between signal-data processing unit and prime amplifier, simultaneously after wave filter immediately following emitter follower, the long distance (>=150m) transmission of drive singal.
Claims (5)
1. the detector for high temperature high radiation environment radioactive nuclide analysis to measure, it is characterized in that: comprise the main measuring sonde for measuring tested ray, for measuring compensation probe and the prime amplifier of the impurity ray in tested ray surrounding environment, described main measuring sonde and compensation probe far put process with prime amplifier, described prime amplifier adopts the duplicate pre-amplification circuit of two-way to make difference processing, wherein a road is for connecting main measuring sonde, and another road compensates probe for connecting.
2. the detector for high temperature high radiation environment radioactive nuclide analysis to measure according to claim 1, it is characterized in that: described main measuring sonde is consistent with compensation sonde configuration, by the sodium iodide scintillator connected successively, glass light guides, photomultiplier composition.
3. the detector for high temperature high radiation environment radioactive nuclide analysis to measure according to claim 1, is characterized in that: described far putting is treated to prime amplifier and probe spacing from >=30 meters.
4. the detector for high temperature high radiation environment radioactive nuclide analysis to measure according to claim 1, it is characterized in that: described prime amplifier is located at >=the thick lead shield box of 5cm in, described lead shield box liner 2mm stainless steel, described prime amplifier adopts double shield layer concentric cable to realize the long-distance transmissions of weak pulse signal.
5. the detector for high temperature high radiation environment radioactive nuclide analysis to measure according to claim 1, is characterized in that: described pre-amplification circuit is by the charge integration sense amplifier, the passive filter circuit that connect successively and penetrate a grade follower and form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510095805.3A CN104820231A (en) | 2015-03-04 | 2015-03-04 | Detector for high temperature and high radiation environment radioactive nuclide analysis and measurement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510095805.3A CN104820231A (en) | 2015-03-04 | 2015-03-04 | Detector for high temperature and high radiation environment radioactive nuclide analysis and measurement |
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| CN104820231A true CN104820231A (en) | 2015-08-05 |
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| CN201510095805.3A Pending CN104820231A (en) | 2015-03-04 | 2015-03-04 | Detector for high temperature and high radiation environment radioactive nuclide analysis and measurement |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991095A (en) * | 2016-01-06 | 2016-10-05 | 中国科学院等离子体物理研究所 | High-sensitivity anti-radiation preamplifier arranged at far front end |
| CN109615814A (en) * | 2018-12-03 | 2019-04-12 | 中国船舶重工集团公司第七〇九研究所 | Radiation resistance combined type fire detecting arrangement |
| CN113406685A (en) * | 2021-04-28 | 2021-09-17 | 中国核电工程有限公司 | Nuclear radiation detection device capable of transmitting original signals in long distance |
| CN113921151A (en) * | 2021-09-10 | 2022-01-11 | 中国船舶重工集团公司第七一九研究所 | Containment pressure relief and exhaust activity monitoring signal processing system |
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2015
- 2015-03-04 CN CN201510095805.3A patent/CN104820231A/en active Pending
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| JP2000329854A (en) * | 1999-05-20 | 2000-11-30 | Hitachi Ltd | Radiation detecting device and electron microscope and measuring device |
| CN103033838A (en) * | 2012-09-26 | 2013-04-10 | 成都理工大学 | Gaseous tritium activity measuring device |
| CN203444118U (en) * | 2013-08-09 | 2014-02-19 | 中国船舶重工集团公司第七一九研究所 | Radioactive gas activity monitoring device of pipeline containing flammable and explosive gases |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991095A (en) * | 2016-01-06 | 2016-10-05 | 中国科学院等离子体物理研究所 | High-sensitivity anti-radiation preamplifier arranged at far front end |
| CN109615814A (en) * | 2018-12-03 | 2019-04-12 | 中国船舶重工集团公司第七〇九研究所 | Radiation resistance combined type fire detecting arrangement |
| CN113406685A (en) * | 2021-04-28 | 2021-09-17 | 中国核电工程有限公司 | Nuclear radiation detection device capable of transmitting original signals in long distance |
| CN113921151A (en) * | 2021-09-10 | 2022-01-11 | 中国船舶重工集团公司第七一九研究所 | Containment pressure relief and exhaust activity monitoring signal processing system |
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