期刊论文

中文

核技术

0253-3219

2015

38

11

110303-1-110303-6

10.11889/j.0253-3219.2015.hjs.38.110303

国家自然科学基金(No.11375083)资助；

本校为第一机构

用M235大气颗粒物分级采样器采样获得不同范围粒径的可吸入大气颗粒物样品,然后分别用β分析方法和γ分析方法测量不同粒径尺度样品中的~(210)Pb的活度分布。得到大气颗粒物样品中~(210)Pb的体积比活度在不同粒径上的分布范围为0.004 4-1.832 1mBq·m~(-3),最大值均落在0.49-0.95 μm粒径范围。两种分析方法所测得的数据具有近似的活度-粒径分布关系,其离散性变化规律也基本一致,都是在粒径范围为0.49-1.5 μm之间的标准差最大,p计数法测量的数据离散性整体比γ计数法测量的数据偏大。

Background: 210Pb in air has yielded insight on the sources and transit times of aerosols. In an ideal enclosed air mass (closed system with respect to these nuclides), the residence times of aerosols can be obtained from the activity ratios of 210Pb/222Rn, 210Bi/210Pb, and 210Po/210Pb. Through measuring the activity-size distribution of 210Pb in the atmospheric particulates, it is conducive to the use of 210Pb tracer study in atmosphere. Purpose: This study aims to determine the activity-size distribution of 210Pb in the atmospheric particulat...