^(220)Rn 对固体径迹探测器测量 ^(222)Rn 影响的研究

STUDY ON THE EFFECT OF 220 Rn ON THE 222 Rn MEASUREMENT USING SSNTD

本文介绍了２２０Ｒｎ对固体径迹探测器测量２２２Ｒｎ影响的实验研究结果。为了估计氡及子体的年均暴露量，α径迹探测器已广泛用于室内２２２Ｒｎ浓度测量。由于某些探测器采用的滤膜具有很大的空气交换率，在测量过程中２２０Ｒｎ也可以与２２２Ｒｎ一道扩散到测量杯中，对测量结果造成干扰，以致过高估计了被测场所空气中的２２２Ｒｎ浓度，而忽略了２２０Ｒｎ的贡献，这是一个值得注意的问题。

This paper describes the experimental results of influence of 220 Rn on 222 Rn measurement using SSNTD. In order to estimate average annual exposure from radon and its decay products, Alpha Track Detectors have been widely used in the measurement of indoor radon concentration. Since some filter membranes used in some detectors have very large air exchange rates, so that the thoron gas can also enter into the diffusion chamber through the filter together with radon gas during the measurement,which resulted in the causing uncertainty.The radon concentrations in the measured houses were possibly overestimated,and thoron contribution was neglected.