CAJ | 학술논문

利用大流量撞击式分级采样器、放化分离提纯技术和α谱仪测量技术，建立了针对大气颗粒物中210 Po的活度及活度－粒径分布的测量方法，并应用该方法分别于春季和秋季对衡阳市城区大气颗粒物中210 Po的活度及活度－粒径分布进行了测量。实验测量结果表明，衡阳市城区大气颗粒物中210 Po的含量处于正常水平；总体积比活度和质量比活度的分布范围分别为：0．0125 mBq· m－3～1．1658 mBq· m－3、0．4597 Bq· g－1～13．8598 Bq· g－1，体积比活度含量占TSP中总含量93％的210 Po存在于粒径范围小于3．0μm（ PM3．0）的颗粒物中；雾霾天气会提高公众所接受的天然内照射剂量；同时发现雨水对大气颗粒物中210 Po的净化作用较为明显。
이용대류량당격식분급채양기、방화분리제순기술화α보의측량기술，건립료침대대기과립물중210 Po적활도급활도－립경분포적측량방법，병응용해방법분별우춘계화추계대형양시성구대기과립물중210 Po적활도급활도－립경분포진행료측량。실험측량결과표명，형양시성구대기과립물중210 Po적함량처우정상수평；총체적비활도화질량비활도적분포범위분별위：0．0125 mBq· m－3～1．1658 mBq· m－3、0．4597 Bq· g－1～13．8598 Bq· g－1，체적비활도함량점TSP중총함량93％적210 Po존재우립경범위소우3．0μm（ PM3．0）적과립물중；무매천기회제고공음소접수적천연내조사제량；동시발현우수대대기과립물중210 Po적정화작용교위명현。
Using high volume cascade impactor , radiochemical purification technique and alpha -spectrometer measurement technology ,the method was built for measuring 210 Po activity and the activity -particle size distri-bution in atmospheric particulate .210 Po activity and activity -particle size distribution in the atmospheric partic-ulate of Hengyang city was be measured by this method during the spring and autumn .Results of the measure-ment show that ,the level of 210 Po is normal in the atmospheric particulate of Hengyang city ,as volume specific activity and weight specific activity are 0.0125 mBq· m-3 ~1.1658 mBq· m-3 ,0.459 7 Bq· g-1 ~13.859 8 Bq· g -1 .volume specific activity 93 percent of 210 Po is be contained in the TSP atmospheric particulate which particle-size is less 3.0μm (PM3.0);It will improve public acceptance within the natural exposure dose in the haze weather;And 210 Po of atmospheric particulate is been purification more obvious in the rain .