Radon daughter pollution recovery correction method in radon measurement of radon daughter electrostatic adsorption

Abstract

The invention provides a radon daughter pollution recovery correction method in the radon measurement of radon daughter electrostatic adsorption, and the method specifically comprises the steps: S1, enabling a testing system to automatically record a current measurement completion moment, and automatically storing a current Po218 measurement value; S2, cutting off high-voltage static, releasing radon in a mode of ohmic discharging and the high-voltage static of the surface of a daughter collection cavity; S3, starting a sucking pump, and automatically flushing the radon and the daughter collection cavity through fresh air according to the set flushing time; S4, starting the high-voltage static, and switching to a next measurement operation; S5, automatically recording the differences t1 and t2 between the start and end time of the current moment and the end time of the former measurement; S6, calculating the residual Po218 value B1 of the surface of a detector through a formula (shownin the description), and removing the residual Po218 value B1 in a new measurement value. The method provided by the invention can achieve the quick removal of a Po218 pollution value attached to thedetector, and achieve the purpose of the quick recovery of the detection system after pollution.

Description

technical field [0001] The invention relates to the field of nuclear radiation detection, in particular to a correction method for recovering contamination of detectors by radon progeny in radon gas detection based on the principle of electrostatic accumulation and adsorption by using alpha energy spectrum measurement technology. Background technique [0002] When the radionuclide undergoes α decay, it will produce α rays, which are heavy charged particles with strong ionization ability. When they irradiate the mucous membrane of human tissues, they will cause great harm to the human body. The energy of α-rays produced by the decay of different nuclides is different, and the measurement of α-energy spectrum can realize the measurement of a certain nuclide. At present, the measurement of alpha rays produced by the decay of natural radionuclides is mainly applied to the measurement of radon and thoron. According to statistical research, indoor radon pollution is the second la...

AI Technical Summary

Problems solved by technology

But the decay of the radon daughter itself requires waiting time

In actual work, it is often necessary to carry out the measurement work of the next measurement point before the radon progeny is completely decayed and eliminated. At this time, the background of the detector will affect the measurement work of the next measurement point

Images