环境水平总α／总β活度测量  

The Gross α and/or βActivity Measurement of Environmental Levels

作　　者：陈靖[1] 刘皓然[1] 方超[1] 杨元第[1] 

机构地区：[1]中国计量科学研究院,北京100013

出　　处：《计量学报》2011年第B12期5-8,共4页Acta Metrologica Sinica

摘　　要：研制了测量环境水平总α、总β活度浓度的低本底αβ测量仪。该测量仪选择塑料闪烁体作为传感器，利用反符合技术降低本底，搭载有6个独立的低本底α／β主探测器，可同时测6个样品，并给出各个样品中的总α／总β活度浓度。实验结果表明：该仪器对于90Sr-90Yβ源的2π探测效率比≥50％时，本底≤0．9cm2／min；仪器对于239Puct源的2π效率比≥80％时，本底≤0．008cm2／min；α／β交叉性能：3％的α进入β道，0．5％的β进入α道。An low-background α and/or β measuring instrument was developed which can measure the gross et and/or 13 activity of environmental levels. A plastic scintillator was ehoosed as sensor and anti-coincidence technique was used to lower the background. Because of being equipped with six separate low-background α / β main detector, the instrument is to measure six samples simultaneously and give the gross α and/or β activity. The experiment results indicate that90Sr-90Y 13 2πr counting efficiency ratio is 50% with a background of 0.9cm/min ,239pu α 2π counting efficiency ratio is 80% with a background of 0.008 cm/min

关 键 词：计量学 活度测量 α/β 低本底 

分 类 号：TB98[一般工业技术—计量学]