George A C
Health Phys. 1984 Apr;46(4):867-72. doi: 10.1097/00004032-198404000-00012.
Activated carbon canisters were tested to determine their adsorption and retention characteristics for radon. Our tests conducted indoors under typical conditions of temperature and relative humidity indicate that simple, inexpensive and maintenance-free passive devices containing 150-200 g of activated carbon can measure radon conveniently and adequately. The amount of radon absorbed in the collector is determined by counting the gamma rays from the decay products of radon. The lower limit of detection for radon is 0.2 pCi/l. for an exposure of 72 hr. Greater sensitivity can be obtained with larger counting systems and devices containing carbon with more surface area. Tests in a residential building and in a test chamber indicate that the measured radon in the canister is proportional to the mean concentration of radon during the period of exposure when correction for relative humidity is made. For practical situations encountered indoors, the device yields results accurate to within +/- 20%. Results from field measurements indicate that the use of the device is feasible.
对活性炭罐进行了测试，以确定其对氡的吸附和保留特性。我们在室内典型温度和相对湿度条件下进行的测试表明，含有150 - 200克活性炭的简单、廉价且无需维护的被动式装置能够方便且充分地测量氡。收集器中吸收的氡量通过对氡衰变产物产生的伽马射线进行计数来确定。对于72小时的暴露，氡的检测下限为0.2皮居里/升。使用更大的计数系统和含有更多表面积碳的装置可获得更高的灵敏度。在住宅建筑和测试室内进行的测试表明，在对相对湿度进行校正后，罐中测得的氡与暴露期间氡的平均浓度成正比。对于室内实际情况，该装置产生的结果精确到±20%以内。现场测量结果表明该装置的使用是可行的。
