Srivastava G K, Raghavayya M, Kotrappa P, Somasundaram S
Health Phys. 1986 Feb;50(2):217-21. doi: 10.1097/00004032-198602000-00005.
Uranium miners were made to inhale Rn-free medical O2 and exhale through a 5.2-1 A1 chamber before reporting to work. The chamber was sealed and isolated from the sampling circuit. An electrostatic plate collected the freshly formed Rn-decay products. The subsequent programmed alpha counting of the plate yielded a Rn concentration in the exhaled breath. Assuming that the exhaled breath represents a certain fraction of the Rn produced inside the body, the body burden of 226Ra was calculated. Standardisation of this procedure and the data collected on 310 miners are discussed. The procedure is simple and applicable for routine measurements. The miner needs to be in the laboratory for only 10 min. The system is also portable for field application. For routine use, the minimum detectable concentration is 3.87 Bq X m-3 which corresponds to a body burden of 0.26 kBq in a typical miner, if one assumes the Rn release fraction from the body as 84%. The system offers a more convenient and sensitive alternative to whole-body counting of workers for 226Ra.
铀矿工人在报到上班前，需吸入不含氡的医用氧气，并通过一个5.2 - 1的A1腔室呼气。该腔室被密封并与采样回路隔离。一块静电板收集新形成的氡衰变产物。随后对该板进行编程α计数，得出呼气中的氡浓度。假设呼出的气体代表体内产生的一定比例的氡，据此计算出226镭的体内负荷量。讨论了该程序的标准化以及在310名矿工身上收集的数据。该程序简单，适用于常规测量。矿工只需在实验室待10分钟。该系统也便于携带，可用于现场应用。对于常规使用，最低可检测浓度为3.87贝克勒尔每立方米，如果假设氡从体内释放的比例为84%，这对应于一名典型矿工0.26千贝克勒尔的体内负荷量。该系统为工人进行226镭全身计数提供了一种更便捷、更灵敏的替代方法。
