摘要
采用多级撞击采样法对某涉核场所的气溶胶粒径一活度谱进行了分析与研究。发现气溶胶粒径活度谱呈双峰形分布,活度分别在0.3μm和5μm粒径附近达到极大值,1.3μm附近为极小值。根据TEM和EDX分析结果可以推断:粒径-活度谱呈双峰形分布的原因与现场环境中气溶胶性质和组分密切相关,多个小颗粒结合形成稍大粒径的颗粒,这些稍大粒径的颗粒表现出另一个活度分布的峰形。在最易穿透粒径0.3μm附近的活度分布对于内照射剂量评价具有重要意义。
Using multiple impactor sampler,the relationship between aerosol diameter and activity had been investigated in a facility of processing nuclear materials.It was shown that the shape of size-activity spectrum was double-peaks.'T wo peaks were around 0.3μm and 5μm.respectively.Between two peaks,the valley point of activity was found at 1.3μm.According to the results by TEM and EDX,the special component and characteristics of aerosol particles might lead to the double-peaks.Several small aerosol particles attached together become a bigger particle.Then those bigger particles contribute to another peak appeared.The distribution of activity around 0.3μm,the best penetration size,can be used for internal irradiation dose estimation of artificial radioactive aerosol.
作者
张宏俊
张海玲
田相玉
文继
孙志敏
熊忠华
帅茂兵
ZHANG Hong-jun;ZHANG Hai-ling;TIAN Xiang-yu;WEN Ji;SUN Zhi-min;XIONG Zhong-hua;SHUAI Mao-bing(Institute of Materials,China Academy of Engineering Physics,Mianyang,Sichuan 621900,China)
出处
《核电子学与探测技术》
CAS
北大核心
2020年第2期205-209,共5页
Nuclear Electronics & Detection Technology
基金
国家自然科学基金(21407133)资助。
关键词
人工放射性气溶胶
气溶胶粒径
撞击采样器
剂量评价
artificial radioactivity aerosol
aerosol diameter
impactor sampler
dose estimation
