Flow air type soil radon gas source collection device and collection method

Abstract

The invention discloses a flow gas type soil radon source collecting device and a collecting method. The flow gas type soil radon source collecting device comprises a drier, a direct current pump, a humidity controller, a buffer bottle, a temperature / humidity sensor, a radon monitor, a flowmeter, a filter, a soil gas sampling rod, a plurality of solenoid valves, and a plurality of ball valves; oneend of the soil gas sampling rod is connected with the gas inlet end of a first ball valve through a gas pipe; the gas outlet end of the first ball valve is connected with the filter, a second ball valve, a third ball valve, a first solenoid valve, a fourth ball valve, and a fifth ball valve in series connection through a gas pipe successively so as to form a system loop; the gas outlet end of the fifth ball valve is connected with a gas outlet pipe; the system loop is connected with an air drying loop, a gas pumping loop, a humidity control system, and a buffer loop. The collecting method iscapable of establishing a flow gas type soil radon source capable of stimulating a plurality of measuring environments through collecting radon sources from soil using the flow gas type soil radon source collecting device, and satisfying requirements of radon measuring device calibration and scientific research.

Description

technical field [0001] The invention relates to the technical field of radiation measurement, in particular to a device and a method for collecting radon gas sources from soil by means of air flow. Background technique [0002] Radon is a naturally occurring radioactive noble gas that is ubiquitous in nature. Radon and its progeny account for about 50% of the annual effective dose of natural radiation to the public. It is listed as one of the 19 substances that cause cancer, and is an important factor that causes respiratory diseases and lung cancer. The measurement of radon concentration is the basis for evaluating the hazards of radon radiation, and it is also an important means of radon prospecting and earthquake prediction. The radon gas source plays an important role in the traceability and transfer of the radon level, and in ensuring the uniformity, accuracy and reliability of the radon measuring instrument. At the same time, the research on radon measurement and eva...

AI Technical Summary

Problems solved by technology

However, as the country’s regulatory requirements for radioactive standard sources and their source materials become more and more stringent, and at the same time, the procurement cycle of radioactive sources is long, the procurement procedures are cumbersome, and the price is high, especially when the old radon sources are decommissioned. As a result, many units are facing the situation of passive availability

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