SIMULTANEOUS DETERMINATION OF PB-210, GROSS-BETA AND GROSS-ALPHA ACTIVITIES OF AIR FILTERS BY PULSE-SHAPE DISCRIMINATION LIQUID SCINTILLATION-COUNTING

被引：5

作者：

BOURABEE, F ^{[1
]}

BAKIR, YY ^{[1
]}

BEM, H ^{[1
]}

机构：

[1] MINIST PUBL HLTH KUWAIT,DEPT RADIAT PROTECT,SAFAT,KUWAIT

来源：

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES | 1995年 / 194卷 / 02期

关键词：

D O I：

10.1007/BF02038440

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A chemical procedure for transferring deposited solid matter from a cellulose filter into the liquid scintillation cocktail has been described. The influence of chemical and color quenching on alpha and beta detection efficiency, as well as on misclassification of beta and alpha pulses was corrected by an external standard method. Under the chosen pulse shape discrimination level (PSD), the alpha and beta detection efficiencies were above 85% and spillovers of alpha and beta pulses were below 10% and 2% respectively. Determination limits for samples containing up to 200 mg of mineral matter were 0.015 mBq m(-3) for alpha, 0.055 mBq.m(-3) for Pb-210 and 0.055 mBq.m(-3) for beta activity (counting time 12000 s and volume of filtered air similar to 1000 m(3)). The method has been applied for routine monitoring of Pb-210 as well as for gross alpha and beta activities of longer-living radionuclides (T-1/2.>11 hrs) in suspended air matter.

引用

页码：403 / 409

页数：7

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