TDCR液闪分析仪Hidex300SL和SIM-MAX LSA3000在 β 核素测量中的性能比较

本实验通过对不同活度样品的测量比较了两台TDCR液闪分析仪(Hidex 300SL和SIM-MAX LSA3000)在性能上的差异。结果表明:SIM-MAX LSA3000的本底和最小可探测活度更低,在低活度样品的测量上占有优势;用TDCR淬灭校正法对常规活度样品进行测量,两台液闪分析仪测量误差都小于1.5%,不确定度(k=2)小于2%,准确性均良好。对于计数率大于1×10⁵ cpm的高活度的样品,两台液闪分析仪的测量结果均偏大,但SIM-MAX LSA3000偏大更加明显。

Comparison of TDCR liquid scintillation analysis counters Hidex 300SL and SIM-MAX LSA3000 in the measurement ofβ-nuclides

In this experiment,the performance differences of two TDCR liquid scintillation analyzers were compared by measuring the samples with different activities.The results show that the background and minimum detectable activity of SIM-MAX LSA3000 are lower,and the measurement of low activity samples is superior than that of Hidex 300SL.The TDCR quenching and correcting method was used to measure the conventional activity samples.The accuracy of the two liquid scintillation analyzers was good,the error was less than 1.5%,and the uncertainty(k=2)was less than 2%.For the high activity samples whose counting rate is more than 1×105 cpm,the results of the two liquid scintillation analyzers are larger than the real data,especially the SIM-MAX LSA3000.