A method for identifying weak gamma radioactive sources under environmental background
A gamma radiation source and identification method technology, which is applied in the field of weak gamma radiation source identification under environmental background, can solve the problems of being easily affected by environmental background, weak gamma radiation source, and weak detector signal, etc., and achieves convenient operation and high efficiency. Application value, reasonable design effect
Active Publication Date: 2022-04-22
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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[0004] The purpose of the present invention is to provide a method for identifying weak gamma radioactive sources under environmental background in view of the problem that the signal of the detector will be relatively weak and easily affected by the environmental background when the radioactive source is far away in the field environment
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Embodiment 1
[0046] Experimental use 241 Am and 137 Cs gamma radioactive source simulates pollution. 241 Am and 137 The characteristic gamma rays of the Cs source are 59.5keV and 661keV, respectively. The 2πγ emission rates of the two sources are 2.56E+04 / s and 3.18E+04 / s, respectively. In the experiment, the detector uses Ф1.5'×1.5' lanthanum bromide LaBr 3 scintillator detector. 241 Am and 137 The Csγ radiation source is measured at different distances from the detector at a position of 0.5m, and the source signal characteristics in the detector signal are analyzed, and the R ref To judge whether a radioactive source is found, the judgment method is as described above.
[0047] When the detector is selected, its intrinsic detection efficiency is correspondingly fixed. There are two factors that affect source judgment: time and distance. The measurement time is divided into 3 representative intervals: second level, 10 second level and minute level. The measuring distance ranges ...
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The invention discloses a method for identifying a weak gamma radioactive source under environmental background, which belongs to the field of weak signal identification, and aims to solve the problem that in the field environment, when the radioactive source is far away, the signal of the detector will be relatively weak, which is easily affected by the environmental background. problem of impact. The method includes the following steps: (1) Determining the background characteristic value R ref ; (2) actual measurement; (3) comparison: if the R measured in step 2 and the background feature value R measured in step 1 ref match, or meet within the error range, it can be considered that there is no artificial gamma radiation source; if the R measured in step 2 is the same as the background characteristic value R measured in step 1 ref If the difference is greater than a certain threshold, it is determined that there is an artificial gamma radiation source in the environment. Based on the improvement of the above method, the present invention can effectively realize the weak signal recognition of the artificial gamma radiation source under the environmental background, and effectively solve the problems existing in the above method. The invention has the advantages of convenient operation, reasonable design, high experimental measurement accuracy and high application value.
Description
technical field [0001] The invention relates to the field of radiation measurement, especially the field of weak signal identification, and specifically relates to a method for identifying weak gamma radiation sources under environmental background. Background technique [0002] Natural radiation background levels vary for many reasons (e.g. altitude, shielding, self-shielding, building structure, building materials, soil type, time of day, season, solar activity, etc.) and can vary widely. Since the radioactive source in the field is far away, the signal of the detector will be relatively weak. At this time, the fluctuation of the background will seriously affect the identification of radioactive source signals. [0003] For this reason, a new method is urgently needed to solve the above problems. Contents of the invention [0004] The purpose of the present invention is to provide a method for identifying weak gamma radioactive sources under environmental background in...
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IPC IPC(8): G01T1/202
CPCG01T1/202
Inventor 文继张宏俊陈想林莫钊洪熊忠华田青青帅茂兵
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS