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测量水中α放射性,通常是将样品蒸发烘干,然后用ZnS(Ag)闪烁计数器测量其总α放射性,这种方法不能做能谱分析。 我们研制的大面积(300cm~2)平行板屏栅电离室可作为能谱分析装置,其能量分辨率为36±5 keV(φ10 mm~(239)Pu电沉积源),4-6MeV能区的本底为13计数/h,最小可探测活度为2×10~(-4)Bq(3σ,27h),对大面积源的探测效率为44％。 为了核工业三十年环境质量评价的需要,我们测定了某些铀矿尾矿排放水中的α放
Measurement of alpha radioactivity in water, usually by evaporating and drying the sample, then measuring its total alpha radioactivity using a ZnS (Ag) scintillation counter, can not do spectroscopic analysis. We developed a large area (300cm ~ 2) parallel plate grid ionization chamber can be used as the energy spectrum analysis device, the energy resolution of 36 ± 5 keV (φ10 mm ~ (239) Pu electrodeposition source), 4-6MeV energy region The background was 13 counts / h, the minimum detectable activity was 2 × 10 -4 Bq (3σ, 27h), and the detection efficiency was 44% for a large area source. In order to meet the needs of the nuclear industry for 30 years of environmental quality assessment, we measured the α emission from the discharge water of some uranium ore tailings