活性炭法测量氡析出率的影响因素研究

Study Of the Influencing Factors Of Measuring Radon Exhalation Rate By the Method Of The Activated Charcoal Absorption

用实验研究了活性炭法测介质表面氡析出率的影响因素。采用24h的收集时间,用含水海绵模拟介质的不同含水率,使用100g活性炭,测量混凝土等介质表面时,活性炭每多吸收1g水造成测量值减少约1%,测量石膏介质表面时,活性炭每多吸收1g水造成测量值减少约1.85%。正常测量情况下,在石膏板析出率模型上测量时,收集时间从24h增大到48h和72h,氡析出率测量值分别减小了12%和25%左右,对于密度较大的介质,如混凝土等,反扩散效应不明显。

The influencing factor of measuring radon exhalation rate is studied with the method of the activated charcoal absorption . The sampling time is 24 hours, and water sponge is used to simulate the medium with different water. We use 100g activated charcoal tO measure different materials. It is found that when we measure concrete surface, activated charcoal absorbs move than l g water, educing the measured value by about 1%. When we measure plaster surfaces, activated charcoal absorbs move than lg water, educing the measured value by about 1.85%. In normal condition, measured value of the radon exhalation rate from plaster surfaces reduces by about 12% and 25% respectively, when we lengthen the sampling time from 24 hours to 48 hours and 72 hours. The anti - diffusion effects are not obvious to the medium which is biggish such in density as concrete.