Safe monitoring method for radioactive source during flaw detection

Abstract

The invention discloses a safe monitoring method for a radioactive source during flaw detection. The method comprises the following steps: (1) when an automatic control instrument sends out a radioactive source working signal, comparing and analyzing by a central processor to obtain a result that the radiation dose rate of the radioactive source acquired by a radiation dose rate signal acquisition module is increased based on the background radiation dose rate and reaches the radiation dose rate of a source storage device, and obtaining that the radioactive source works normally; (2) when the automatic control instrument sends out a radioactive source storage signal, comparing and analyzing by the central processor to obtain a result that the radiation dose rate of the radioactive source acquired by the radiation dose rate signal acquisition module is reduced to be less than 30% of the radiation dose rate of the source storage device, and judging that the radioactive source works normally; comparing and analyzing by the central processor to obtain a result that the radiation dose rate of the radioactive source acquired by the radiation dose rate signal acquisition module is still not reduced to be less than 30% of the radiation dose rate of the source storage device, judging that the radioactive source is not recovered in the source storage device and the radioactive source works abnormally, and giving an alarm by an alarm module to finish the safe monitoring process.

Description

technical field [0001] The invention relates to the field of radiation source monitoring, in particular to a method for safety monitoring of radiation sources in flaw detection operations. Background technique [0002] my country is a big country in the production and use of radioisotopes, and radioactive sources have been widely used in industry, agriculture, medicine, resources, environment, military, scientific research and other fields. There are 1,500 units using radioisotope and radiation devices in Sichuan Province, and more than 3,700 radioactive sources are in use, of which gamma sources account for more than 80%. In recent years, incidents of loss and theft of radioactive sources due to poor management and other reasons have occurred from time to time, leading to many radioactive pollution accidents and seriously threatening the lives and health of the people; according to Tianjin Environmental Protection Bureau: On May 7, 2014, Tianjin Hongdi Engineering Inspecti...

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Problems solved by technology

[0003] Due to the frequent use of industrial flaw detection radioactive sources and complex working conditions, source jamming and source-off accidents (mainly source whips falling off) are prone to occur in the process of source extraction and collection. Difficult to identify and judge, and unable to report to the police in time, causing serious accidents, is a major safety hazard in flaw detection operations

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