氡室用冷凝式气溶胶发生器的研究  

Development of a Condensation Aerosol Generator

作　　者：刘翠红[1] 张燕[1] 郭秋菊[2] 罗明[1] 段再煜[1] 闫学昆[1] 张磊[1] 谷铁男[1] 

机构地区：[1]海军核化安全研究所,北京100077 [2]北京大学物理学院技术物理系,北京100086

出　　处：《核电子学与探测技术》2012年第11期1283-1288,共6页Nuclear Electronics & Detection Technology

摘　　要：单分散性气溶胶发生器是氡室中控制氡子体浓度和平衡因子时必要的仪器。为实现氡室中氡子体浓度的控制和氡子体附着放射性气溶胶行为规律的研究,自行搭建了一套冷凝式气溶胶发生器。该装置主要由喷雾式凝结核发生器、饱和器及再加热冷凝装置组成,可以发生出纯NaCl凝结核、纯DE-HS液滴及NaCl+DEHS混合型气溶胶粒子。实验表明,该装置发生的纯NaCl凝结核和NaCl+DEHS混合型气溶胶粒子可以保证很好的单分散性,而纯DEHS液滴分散性一般较大。改变总的气流量、NaCl溶液浓度、干燥剂用量、饱和器温度、再加热器温度及不同回路分支比可以控制产生不同种类不同粒径分布的气溶胶粒子。实验结果同气溶胶发生的基本理论符合。Monodisperse aerosol generator is the necessary equipment when controlling the concentration and equilibrium factor of radon daughter in radon chamber. In order to achieve the control of the concentration of radon daughters and the pattern of behavior research which radon daughters attached to radioactive aerosol in radon chamber, this paper set up a condensation aerosol generator. The device consisits of aerosol condensation nuclei generator, saturator and reheating condensation device, and can happen out of pure NaC1 nuclei, pure DEHS droplets and NaC1 ＋ DEHS mixed aerosol particles. Experiments showed that the good monodispersity of pure NaCI nuclei and NaC1 ＋ DEHS mixed aerosol particles can be kept, and pure DEHS droplets dispersed generally higher. Different types and different particle size distribution can be controlled by changing the overall gas flow, the concentration of NaC1 solution, the amount of desiccant, the temperature of saturator, reheater temperature and the different branching ratio. The results may be in line with the basic theory of aerosol generator.

关 键 词：气溶胶发生器 冷凝式 单分散性 粒径分布 浓度 

分 类 号：TL72[核科学技术—辐射防护及环境保护]