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Development of a device for the size distribution measurement of radioactive ions

放射性离子粒径分布测量装置的研制

基本信息

批准号：
03558021
负责人：
MOCHIZUKI Sadamu
金额：
$ 3.9万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03558021/
关键词：
radioactive ion radioactive aerosol size distribution radon daughters

项目摘要

1. A device was developed for the measurements of the size distribution of radioactive ions. The device was consisted of following three parts.1) Mobility analyzerFor measuring the mobility distribution of ions, a so-called second order differential method was adopted. The analyzer developed was consisted of a cylindrical condenser of the type of Gerdien aspirator and a radioactive aerosol collector provided with a silicon semiconductor detectors. Dimensions of the analyzer and air flow rates are as follows ; Diameter of the outer electrode : 12 cm, Diameter of the inner electrode : 10 cm, Length of inner electrode : first segment 102 cm and second segment 55 cm, Sample air flow rate : 12.5 1/min and Clean air flow rate : 27.5 1/min.2) D.C sourceFor scanning the mobility range * 0.5-10 x 10^<-4>cm^2/v.sec, a D.C source which consists of a stabilizer, a rectifier and a potential divider was developed.3) A device for the collection and analysis of the radioactive aerosolsA device consisted of roll filter, two silicon semiconductor detectors, and two pulse hight analyzers was developed. By this device, simultaneous measurements of growth and decay of the radioactive aerosols collected on the filter are possible.2. At the present time, it leaves something to be desired, but the device developed and newly constructed is thought to be useful to measure the size distribution of radioactive ions with fairly accurate resolution and measuring accuracy.

1.本文介绍了一种测量放射性离子粒径分布的装置。该装置由以下三部分组成：1）迁移率分析仪为了测量离子的迁移率分布，采用了所谓的二阶微分法。所开发的分析仪由Gerdien抽吸器类型的圆柱形冷凝器和配备有硅半导体检测器的放射性气溶胶收集器组成。分析仪的尺寸和空气流速如下：外电极的直径：12 cm，内电极的直径：10 cm，内电极的长度：第一段102 cm和第二段55 cm，样品空气流速：12.5 l/min和清洁空气流速：27.5 1/min。2）直流源为扫描迁移率范围 * 0.5-10 × 10 ~（-1）<-4>cm ~ 2/v·sec，研制了一种由稳压器、整流器和分压器组成的直流源。3）放射性气溶胶收集和分析装置。研制了两台硅半导体探测器和两台脉冲高度分析仪。通过该装置，可以同时测量过滤器上收集的放射性气溶胶的生长和衰变。目前，它留下了一些需要改进的地方，但开发和新建造的装置被认为是有用的，以相当准确的分辨率和测量精度测量放射性离子的尺寸分布。