Luetzelschwab J W, Hastings L, Ellis S M
Department of Physics and Astronomy, Dickinson College, Carlisle, PA 17013-2896.
Health Phys. 1994 Jan;66(1):63-71. doi: 10.1097/00004032-199401000-00009.
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 approximately 48 h while the barrier canister integrates over a period of approximately 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.
将开放式和扩散阻挡型活性炭罐分别置于一个试验箱中，使其暴露在固定的温度、湿度和氡浓度下7天。每隔3小时测量受试活性炭罐中的氡子体活度。对开放式活性炭罐共进行了15次试验，对阻挡型活性炭罐进行了9次试验，温度范围为15 - 30摄氏度，绝对湿度范围分别为0 - 15克/立方米。此外，还进行了几次试验，在7天内改变氡、温度和湿度。结果表明，在15摄氏度时，开放式活性炭罐吸附氡的效率比在30摄氏度时高出60%，而阻挡型活性炭罐对温度的依赖性较小。阻挡型活性炭罐对湿度影响的敏感度远低于开放式活性炭罐。当用于测量空气中的氡浓度时，开放式活性炭罐的积分时间仅约为48小时，而阻挡型活性炭罐的积分时间约为96小时。积分时间短以及开放式活性炭罐对水吸附的干扰表明，开放式活性炭罐应在48小时及以内的暴露时间使用。
