The Working Method of Environmental Gamma Energy Spectrum Continuous Monitoring System
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A technology of monitoring system and working method, 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, long time of spectrum stabilization, etc., to achieve fast spectrum stabilization, good resolution, and accurate measurement results Effect
Active Publication Date: 2018-01-19
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
[0062] In the present embodiment, detection element 13 is NaI (Tl) crystal, Φ 76 * 76mm, photomultiplier tube 15 adopts Hamamatsu R6233 photomultiplier tube, stable spectrum material 121 is analytical pure potassium carbonate, quality 50g, pressed into Φ 50 * 12mm , placed in the housing 120 . When the spectrum is stable, the energy spectrum acquisition time t c for 300s, E c is 1.46MeV ( 40 The characteristic peak of K), looking for the peak position C of potassium p , to perform energy calibration on the spectrometer.
[0063] According to the above design scheme, a corresponding environmental gamma energy spectrum continuous monitoring system is formed, which has high detection sensitivity, rapid and reliable spectrum stabilization, accurate measurement, and a resolution of 7.5% (for 662keV).
Embodiment 2
[0065] 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 analytically pure thorium dioxide, mass 5g, pressed into Φ10×8mm, placed in shell 120 . When the spectrum is stable, the energy spectrum acquisition time t c 120s, E c is 2.62MeV ( 232 The characteristic peak of Th), looking for the peak position of thorium C p , to perform energy calibration on the spectrometer.
[0066] According to the above design scheme, a corresponding environmental gamma energy spectrum continuous monitoring system is formed, which has high detection sensitivity, rapid and reliable spectrum stabilization, accurate measurement, and a resolution of up to 2.8% (for 662keV).
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Abstract
The invention discloses a working method of an environmental gamma energy spectrum continuous monitoring system. First, at a specific temperature, various standard sources are used to perform energy calibration on the environmental gamma energy spectrum continuous monitoring system, and the multi-channel analyzer track Ci and gamma The corresponding relationship Ei=f(Ci) of ray energy Ei, and store it in the electronic system; the environmental gamma energy spectrum continuous monitoring system has a power-on stable spectrum mode and a measurement mode, and the environmental gamma energy spectrum continuous monitoring system will , run the power-on spectrum stabilization mode, after the power-on spectrum stabilization mode is executed, the environmental gamma energy spectrum continuous monitoring system enters the measurement mode, stores the measurement results in the memory, uploads them to the terminal and displays them. The environmental gamma energy spectrum continuous monitoring system of the present invention has built-in automatic spectrum stabilization of natural radioactive substances, has high sensitivity and good resolution, is used for continuous monitoring of environmental gamma air absorbed dose rate, and can analyze and identify gamma nuclides in the environment.
Description
technical field [0001] The invention belongs to the field of radiation detection, and in particular relates to a working method of 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. The radiation dose rate of X and gamma rays (hereinafter referred to as rays) in the atmospheric environment is monitored in real time by the monitor to obtain the changes in the intensity of radioactive substances in the atmospheric environment. Abnormal changes in radioactive substances provide a basis for environmental assessment and accident alarms. Traditional environmental radiation dose rate monitors mainly use two types of nuclear radiation detectors, GM tubes and high-pressure ionization chambers. Among them, GM tubes are rarely used as precise measuring instruments because of their short servic...
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