基于β射线吸收法的可吸入颗粒物检测仪

Absorbable Particulates Detecting Instrument Based on β-Ray Absorption Method

设计了用于环境空气质量监测系统的、基于β射线吸收法的可吸入颗粒物检测仪。可吸入颗粒物的浓度是利用C14放射源射出的β射线照射灰尘时被吸收导致其强度衰减的原理实现检测的。检测仪以PC104总线工控机为测控核心,设计和开发了闪烁光子计数器与测控软件,通过与标准过滤称重法的对比试验,证明研制的β射线吸收法可吸入颗粒物检测仪满足测量精度要求。

An absorbable particulates detecting instrument was researched and developed based on 13 - ray absorption method. The concentration of absorbable particulates was detected according to the theory that the strength of 13 - ray emitted by C^4 radioat- ive source was attenuated and absorbed by the particulates collected. The instrument was researched and developed with PC104 bus industrial computer as the core of measuring and controlling, and scintillation counter and measuring and controlling software were designed and integrated effectively. Through the comparision experiments between the 13 - ray absorption and conventional standard weighing methods,it is proved that this absorbable particulates detecting instrument based on 13 -ray absorption method can meet the accuracy and precision requirements.