Portable type radon emanation and thorium emanation detector

Abstract

The present invention provides a portable type radon emanation and thorium emanation detector including a detecting chamber, the detecting chamber includes a sampling cavity for sampling and analyzing air, and an exhausting cavity for exhausting the analyzed gas. An air inlet port is arranged on the side wall of the sampling cavity, and a gas exhaust port is arranged on the side wall of the exhausting cavity. The sampling cavity furthermore includes: a filtering part arranged between the sampling cavity and the exhausting cavity; and a sampling part arranged on the position opposite to the exhausting cavity. The portable type radon emanation and thorium emanation detector enables the radon emanation and thorium emanation to combine with an aerosol by utilizing two diffusion cavities separated by glass fibre, and a formed radioactive aerosol daughter is retarded in the filtering part, and alpha particles emitted by the daughter form a radiation damage track on a track detecting element after the alpha particles are emitted to the sampling part. A track density on the track detecting element is detected after accumulated monitoring, thereby calculating various alpha potential energy concentrations caused by the track density.

Description

technical field [0001] The invention relates to the fields of occupational health and air quality detection, in particular to a detection device capable of simultaneously detecting the potential concentration of radon or thoron progeny in the air. Background technique [0002] In mining operations, the health of miners is vulnerable to two substances. One is dust. Its existence leads to the deterioration of the production environment. The human body inhales the mine dust for a long time, which causes an increase in the incidence of respiratory tract and lung inflammation, and further develops into respiratory tract cancer. Tumors and pneumoconiosis. The second is radioactive radon, thoron and their progeny. Radon-induced lung cancer is a random effect of ionizing radiation, and its occurrence rate is positively correlated with the cumulative dose of radon and its progeny inhaled for a long time. Body exposure is the first environmental cause of lung cancer in non-smokers. ...

AI Technical Summary

Problems solved by technology

Due to the unpredictability of personnel activities, the micro-environment around the staff, especially in the human respiratory zone, is affected by the difference in the instantaneous air aerosol level, and the concentration of radon and thoron is changing. Low, long sampling period, only the average value of radon thoron concentration or its progeny α potential concentration can be obtained, and it is impossible to characterize the influence of the changes of the above factors on the personal dose of radiation

[0007] 2. From the point of view of sampling period and working method, the existing passive accumulative instruments cannot accurately grasp the sampling time due to the passive working method. Inevitably there is an estimation bias, which leads to overestimation or underestimation of the α potential concentration, and it is impossible to obtain accurate radiation doses caused by radon and thoron progeny

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