CAJ | 학술논문

选用 M235型大气颗粒物分级采样器，在上海、衡阳等地开展可吸入大气颗粒物(PM10)的粒径分级采样，对比分析了210 Pb活度的不同测量方法。利用210 Bi与210 Pb 在同一衰变链上活度最终平衡的特点，通过低本底β计数测量并计算得到不同粒径尺度上大气颗粒物中210 Pb的活度。结果表明：上海市、衡阳市大气颗粒物中不同粒径范围的210 Pb活度分布非常不均匀，分别约91.58%、91.37%活度分布在粒径范围小于或等于1.5μm的颗粒物中；与利用低本底反康普顿效应的γ谱测量方法得到的结果比较，发现两种方法得出的不同粒径范围大气颗粒物中210 Pb活度分布具有几乎相同的分布规律。
선용 M235형대기과립물분급채양기，재상해、형양등지개전가흡입대기과립물(PM10)적립경분급채양，대비분석료210 Pb활도적불동측량방법。이용210 Bi여210 Pb 재동일쇠변련상활도최종평형적특점，통과저본저β계수측량병계산득도불동립경척도상대기과립물중210 Pb적활도。결과표명：상해시、형양시대기과립물중불동립경범위적210 Pb활도분포비상불균균，분별약91.58%、91.37%활도분포재립경범위소우혹등우1.5μm적과립물중；여이용저본저반강보돈효응적γ보측량방법득도적결과비교，발현량충방법득출적불동립경범위대기과립물중210 Pb활도분포구유궤호상동적분포규률。
Using Model 235 high volume cascade impactor to gather samples in the atmos-pheric particulates (PM10 )of Shanghai and Hengyang.210 Bi and 210 Pb finally get decay balance in the decay chain.After comparing withγ-spectrum method,this study chose the low-backgroundβcounting method to calculate the size distribution of 210 Pb in the different atmospheric particulates.The experimental results show that in the Shanghai and Heng-yang,radioactivities of 210 Pb at different particle size ranges distribute very unevenly in the atmospheric particulates.About 91.58%,91.37% of the 210Pb activity are adsorbed on PM1.5 .After comparing with the result through γ-spectrum method of low-background inverse compton effect,210 Pb activity presents similar size distribution in the atmospheric particulates.