Prichard H M, Mariën K
Health Phys. 1985 Jun;48(6):797-803. doi: 10.1097/00004032-198506000-00007.
A simple passive sampler for 222Rn with up to 24-hr integration times can be constructed by using a diffusion barrier to regulate the effective sampling rate of an ambient temperature activated carbon bed. The diffusion element serves to make sampler performance relatively independent of the properties of the type of carbon used. Satisfactory results are obtained if the total effective sample volume is kept well below the equivalent air volume of the activated carbon bed. The influence of various temperature and Rn profiles on the sampler's performance have been examined by experiment and by simulation. The amount of Rn adsorbed may be measured by gamma spectroscopy, by outgassing into an alpha scintillation flask, or by desorption into a liquid scintillator. In the latter case, a sensitivity of 0.2 pCi l-1 is obtainable for 24-hr exposures.
通过使用扩散屏障来调节环境温度活性炭床的有效采样率，可构建一种用于氡-222的简单被动采样器，其积分时间长达24小时。扩散元件可使采样器性能相对独立于所用碳类型的特性。如果总有效样品体积远低于活性炭床的等效空气体积，则可获得满意的结果。已通过实验和模拟研究了各种温度和氡分布对采样器性能的影响。吸附的氡量可通过伽马能谱法、排放到α闪烁瓶中或解吸到液体闪烁体中来测量。在后一种情况下，24小时暴露的灵敏度可达0.2皮居里/升。
