Prichard H M
Health Phys. 1983 Aug;45(2):493-9.
The high solubility of radon in cold organic solvents is exploited to extract radon directly from a sample air stream into a hexane-based liquid scintillation solution. Up to 10 l. of air is passed through 20 ml of solvent held at -78 degrees C in a bath of dry ice and acetone. The solvent is then transferred to an ordinary glass liquid scintillation vial that has been preloaded with 2 ml of concentrated fluors. A large number of samples can be prepared in a short time with minimal equipment, making it possible for field workers to conveniently collect numerous samples prior to returning to the laboratory. After allowing an interval of at least 3 hr after processing for radon daughter ingrowth, the vials are counted on an unmodified liquid scintillation system with a narrow window set around the radon and polonium alpha peaks. The large sample volume more than compensates for the relatively high alpha background of liquid scintillators. Relevant theoretical considerations and alternate sampling strategies are discussed.
氡在冷有机溶剂中的高溶解度被用于将氡直接从样品气流中提取到基于己烷的液体闪烁溶液中。多达10升的空气通过20毫升保持在干冰和丙酮浴中-78摄氏度的溶剂。然后将溶剂转移到一个预先装有2毫升浓缩荧光剂的普通玻璃液体闪烁瓶中。使用最少的设备可以在短时间内制备大量样品，这使得现场工作人员在返回实验室之前能够方便地采集大量样品。在处理后允许至少3小时的时间让氡子体生长，然后在未改装的液体闪烁系统上对样品瓶进行计数，该系统在氡和钋的α峰周围设置了窄窗口。大的样品体积足以弥补液体闪烁体相对较高的α本底。文中讨论了相关的理论考虑因素和替代采样策略。
