小型氡室氡浓度准确性影响因素的探讨

Discussion on Influence Factors of Radon Concentration's Accuracy of Small Radon Chamber

小型氡室是一种综合测氡仪器的标定装置,适合目前各种测氡仪器的标定。湿度、温度、闪烁探测器的漏计现象等因素影响氡室内氡浓度。湿度影响着气溶胶的密度,湿度越大,气溶胶的密度也越大,导致探测器探测的计数也变大;温度增加,分子的扩散系数随着增加,使镭源释放的氡量增加,导致氡浓度变大;闪烁体的发光衰减时间较长,测量大活度样品时,会出现漏计现象。对应不同的影响因素采取了相应的修正措施。

Small-scale radon chamber is one comprehensive calibrating instrument, which is fit to various kinds of radon detectors at present. Humidity, temperature, missing counting phenomenon of scintillation detector, etc, influence accuracy of radon concentration of radon chamber. The humidity is influencing the density of the aerosol. The bigger the humidity is, the larger the density of the aerosol is, so detector counts more; The diffusion coefficient of the molecule increases with temperature increasing, which makes radon released from radium source increase and causes radon Concentration to increase; Decay time of scintillation luminescence is relatively long. While measure big activity sample, missing counting phenomenon exists. This paper discusses these factors. According to different influencing factors, corresponding revision measurements should be taken.