CAJ | 학술논문

基于放射性核素的衰变平衡条件，使用氡衰变链核素210 Pb、210 Bi和210 Po的参数对大气颗粒物的滞留时间做了理论推导。测量了我国20个城市近地面大气气溶胶的210 Pb和210 Po的活度浓度，得到210 Po/210 Pb活度浓度比值范围为0．28～0．86，对计算结果进行分析。
기우방사성핵소적쇠변평형조건，사용동쇠변련핵소210 Pb、210 Bi화210 Po적삼수대대기과립물적체류시간주료이론추도。측량료아국20개성시근지면대기기용효적210 Pb화210 Po적활도농도，득도210 Po/210 Pb활도농도비치범위위0．28～0．86，대계산결과진행분석。
A theoretical formula of estimating residence time of atmospheric particulate materials is introduced based on the equilibrium condition of radioactive decay .Then we have analyzed aerosol samples from 32 cities in China .The 210 Po/210 Pb activity concentration ratios in aerosol samples varied between 0 .28 and 0 .86 .Fi-nally ,the using conditions and research prospects of the formula for the aerosol residence time have been dis-cussed .