闪烁室和电离室法测氡的气压效应

Air Pressure Effect of a Scintillation Chamber or an Ionization Chamber as Measuring Radon

使用闪烁室法和电离室法的测氡仪有气压效应。闪烁室和电流电离室注入恒量的氡气,改变其内的气压进行放射性计数测量;脉冲电离室的AlphaGUARD便携式氡监测仪则放入一有固体氡源的可调气压的氡室,改变氡室气压对其进行气压效应测试。通过实验表明,在低于常压时闪烁室法测氡的探测效率增高,而电流电离室法和脉冲电离室法测氡的探测效率降低。还对闪烁室法和电离室法测氡的气压效应实验结果进行了初步分析。

The radon detector equipped with a scintillation chamber or an ionization chamber has air pressure effect. We inject constant radon gas into a scintillation chamber or a current ionization chamber,and measure the radioactivity- counting in different inner air pressure. The AlphaGUARD Portable Radon Monitor with a pulse ionization chamber is put into an adjustable air pressure radon chamber which has a solid radon source,and when changing the inner air pressure,we measure air pressure effect. The tests show that the detection efficiency measured by the scintillation chamber increases in underpressure condition, but in the same condition, the detection efficiency measured by the scintillation chamber or the current ionization chamber decreases. We also primarily analyze the results of the pressure effect tests.