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本文描述用液体闪烁计数法直接测定α、β发射体溶液放射性活度的计量仪器。该仪器包括三个光电倍增管的符合探测器和三个输出计数道;以三重对两重符合计数率之比(TDCR)为猝灭参数,通过外推效率曲线至TDCR=1直接得到核素的活度。该仪器用于放射性活度绝对测量至少有两个突出的优点:1.精确度较高,对~3H、~(63)Ni和~(14)C等多种β、α核素其总测量不确定度(3σ)在0.5—1.5％;2.操作简便,测量迅速。
This article describes a direct measurement of the radioactivity of α, β emitter solutions by liquid scintillation counting. The instrument consists of three photomultiplier-matched detectors and three output counting channels; the triplet-to-dual-coincidence ratio (TDCR) is the quenching parameter and the nuclide is obtained directly by extrapolating the efficiency curve to TDCR = 1 Activity The instrument has at least two outstanding advantages for absolute measurement of radioactive activity: 1. High precision, the total measurement of various β, α nuclides such as ~ 3H, ~ (63) Ni and ~ (14) C Uncertainty (3σ) at 0.5-1.5%; 2. Easy to operate, rapid measurement.