ADSORPTION OF RN-222 BY OPEN-FACED AND DIFFUSION-BARRIER CANISTERS AT DIFFERENT CONDITIONS OF TEMPERATURE AND HUMIDITY

被引:17
作者
LUETZELSCHWAB, JW
HASTINGS, L
ELLIS, SM
机构
[1] Department of Physics and Astronomy, Dickinson College, Carlisle, PA 17013-2896
来源
HEALTH PHYSICS | 1994年 / 66卷 / 01期
关键词
AIR SAMPLING; CHARCOAL CANISTERS; RN-222; MONITORS; RADON;
D O I
10.1097/00004032-199401000-00009
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Open-faced and diffusion-barrier charcoal canisters were individually exposed to a fixed temperature, humidity, and radon concentration in a chamber for a period of 7 d. The radon progeny activity in the canister under study was measured every 3 h. A total of 15 runs were made for the open-faced canisters and nine runs for the barrier canisters with temperatures and absolute humidities ranging from 15-30 degrees C and 0-15 g m(-3), respectively. In addition, several runs were made with the radon, temperature, and humidity changing during the 7 d. Results show that open-faced canisters adsorb radon up to 60% more efficiently at 15 degrees C than at 30 degrees C while the barrier canisters show little temperature dependence. The barrier canisters are much less sensitive to humidity effects than the open-faced canister. When used to measure the radon concentration in air, the open-faced canister integrates over a period of only similar to 48 h while the barrier canister integrates over a period of similar to 96 h. The short integration time and the interference of water adsorption by open-faced canisters indicate that the open-faced canisters should be used for exposure times of 48 h and no longer.
引用
收藏
页码:63 / 71
页数:9
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