Environmental gamma energy spectrum continuous monitoring system and working method thereof
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A monitoring system and technology of gamma energy spectrum, which is applied in the field of radiation detection, can solve the problems of long time required for spectrum stabilization, low precision of spectrum stabilization, and long time of spectrum stabilization, and achieve fast stabilization speed, good resolution, and accurate measurement results. accurate effect
Active Publication Date: 2015-05-06
上海新漫传感科技有限公司
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It takes a long time to adjust the parameters of the amplifier or high voltage, and the stabilization accuracy is low.
[0006] In addition, the built-in LED luminescence analog ray stabilization can only compensate the gain of the photomultiplier tube, the gain of the amplifier, and the peak drift caused by the change of high voltage, but the peak drift caused by the change of the luminous efficiency of the detector is not corrected, and the accuracy of the spectrum stabilization is relatively low. Low; the built-in radioactive source stabilizes the spectrum, and the use of radioactive sources will bring a series of problems such as supervision and safety; The spectrum takes a long time, and even the spectrum cannot be stabilized
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Embodiment 1
[0067] In this embodiment, the detection element 13 is NaI(Tl) crystal, Φ76×76mm, the photomultiplier tube 15 uses Hamamatsu R6233 photomultiplier tube, the spectrum stabilizing substance 121 is analytical pure potassium carbonate, the mass is 50g, and it is pressed into Φ50×12mm , Placed in the housing 120. When the spectrum is stabilized, the energy spectrum acquisition time t c For 300s, E c 1.46MeV( 40 The characteristic peak of K), look for the peak position C of potassium p , Perform energy calibration on the energy spectrometer.
[0068] According to the above design scheme, a corresponding environmental γ energy spectrum continuous monitoring system is formed, with high detection sensitivity, rapid and reliable spectrum stabilization, accurate measurement, and a resolution of 7.5% (to 662keV).
Embodiment 2
[0070] In this embodiment, the detection element 13 is LaBr 3 (Ce) crystal, Φ51×51mm, photomultiplier tube 15 adopts ET9215B photomultiplier tube, spectrum stabilizing substance 121 is analytical pure thorium dioxide, mass 5g, pressed into Φ10×8mm, placed in shell 120. When the spectrum is stabilized, the energy spectrum acquisition time t c 120s, E c 2.62MeV( 232 The characteristic peak of Th), looking for the peak position C of thorium p , Perform energy calibration on the energy spectrometer.
[0071] According to the above design scheme, a corresponding environmental γ energy spectrum continuous monitoring system is formed, with high detection sensitivity, rapid and reliable spectrum stabilization, accurate measurement, and a resolution of up to 2.8% (to 662keV).
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Abstract
The invention discloses an environmental gamma energy spectrum continuous monitoring system. The environmental gamma energy spectrum continuous monitoring system comprises a detector for detecting rays and a terminal for displaying and controlling, wherein the detector comprises a housing, a probe arranged in the housing and an electronic system. The probe comprises a shielding housing, a spectrum stabilizing device, a detecting element, a light guide element, a photomultiplier and a front amplifying circuit. The electronic system comprises an amplifier, a multi-channel analyzer, a controller, a memory, a high-voltage power supply and a low-voltage power supply. A NaI (Tl) crystal or LaBr3(Ce) crystal with high sensitivity and high resolution is taken as the detecting element, a substance which internally contains potassium, uranium and thorium automatically stabilizes spectrum, is high in spectrum stabilizing speed and high in precision. The environmental gamma energy spectrum continuous monitoring system is internally provided with a natural radioactive substance to automatically stabilize spectrum, high in sensitivity, good in resolution, used for continuously monitoring yield of the environmental gamma air absorber and can be used for analyzing and identifying gamma nuclide in the environment.
Description
Technical field [0001] The invention belongs to the field of radiation detection, and specifically relates to an environmental gamma energy spectrum continuous monitoring system for measuring environmental X and gamma radiation. Background technique [0002] Environmental radiation dose rate monitoring is an important aspect of environmental monitoring. Real-time monitoring of X and γ-ray (hereinafter referred to as radiation) radiation dose rates in the atmospheric environment is carried out through the monitor, to obtain changes in the intensity of radioactive substances in the atmospheric environment, and to monitor the atmospheric environment. Abnormal changes in radioactive materials provide a basis for environmental assessment and accident alarms. Traditional environmental radiation dose rate monitors mainly use two types of nuclear radiation detectors, GM tube and high-pressure ionization chamber. Among them, the GM tube is rarely used as an accurate measuring instrument ...
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