空气中^(14)C取样与测量方法的实验研究  

SAMPLING AND DETERMINATION OF CARBON 14 IN AIR

作　　者：杨怀元[1] 刘卫[1] 温雪莲[1] 

机构地区：[1]中国辐射防护研究院

出　　处：《辐射防护》1997年第1期68-72,共5页Radiation Protection

摘　　要：本文介绍了一种测定空气中１４Ｃ放射性浓度的方法。采用催化氧化、ＮａＯＨ溶液吸收捕集空气中的ＣＯ２，制备样品，然后用液闪谱仪测量ＣａＣＯ３固体粉末悬浮样品中的１４Ｃ。实际测定了钯－１０４催化床在不同温度下的氧化效率，ＮａＯＨ吸收液对空气中ＣＯ２的收集效率，制样过程中的化学回收率和Ｔｒｉ－Ｃａｒｂ２２５０ＣＡ液闪谱仪对ＣａＣＯ３粉末悬浮样品的计数效率。This paper describes a technique for sampling and measuring the concentration of 14 C in air. This technique inclueds: capturing CO 2 in air with NaOH solution, preparing samples of suspended Ca 14 CO 3 powder, and then determining the 14 C activity with liquid scintillation detector. Experimental determinations were the oxidation efficiency of Pd 104 catalystic bed at different temperature, collection efficiency of NaOH solution for CO 2 in air, chemical recovery rate of sample preparation and the counting efficiency of Tri Carb 2250 CA liquid scintillation spectrometer for CaCO 3 suspended powder samples. Measuring results were given for indoor concentration of 14 C in air at several typical conditions. (

关 键 词：空气 取样 测量 碳14 环境监测 放射性 

分 类 号：X837.01[环境科学与工程—环境工程] X837.02