液闪分析中反符合屏蔽对各种放射性核素计数率的影响  

Influences of Anticoincidence Shield on Liquid Scintillation Count Rates for Various Kinds of Radionuclides

作　　者：赵海鹏[1] 冯孝贵[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京102201

出　　处：《核化学与放射化学》2011年第6期353-357,共5页Journal of Nuclear and Radiochemistry

摘　　要：采用有/无反符合屏蔽的3台液闪仪测定了多种放射性核素的计数率,结果表明:对α核素、纯β核素和不存在β-γ级联辐射的β/γ核素,反符合屏蔽对其计数率的影响可以忽略;但对存在β-γ级联辐射的β/γ核素,反符合屏蔽使其β计数率显著降低。因此,用有反符合屏蔽的液闪仪进行绝对测量时必须考查待测核素的衰变特性。Three liquid scintillation counters with/without anticoincidence shield have been used to determine the count rates for various kinds of radionuclides. The influences of antico- incidence shield on the count rates can be neglected for α-emitters, β-emitters and β/γ emit- ters with no β-γ cascade radiation. However, remarkable decreases of count rates are observed when anticoincidence shield is applied for β/γ emitters with β-γ cascade radiations. If liquid scintillation counter with anticoincidence shield is employed as absolute measurement method, the decay properties of the measured radionuclide should be in consideration.

关 键 词：液闪 反符合屏蔽 放射性核素 计数率 β-γ级联辐射 

分 类 号：TL812.2[核科学技术—核技术及应用]