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介绍一种配以锗探测器的γ射线能谱仪直接测定天然水中~(222)Rn的方法.仪器:样品计数用同轴型锗探测器,该仪器在1.33MeV处的分辨率(FWHM)是1.97keV.其信号经PGT RCB/11C前置放大器放大后,输入NAIG E系列-4096道分析器.采样:为得到高活性的样品,采集了日本Missasa-spa温泉水,把采得水样小心放进四个2000ml的井型样品容器.该容器入口有硅管以防鼓泡.测量:装样容器装满水后,把进水和出水口都用树脂密封,放置三小时使~(222)Rn和子体~(214)Pb达
A method for direct determination of ~ (222) Rn in natural water by a γ-ray spectrometer equipped with a germanium detector is described: Instrument: The sample is counted with a coaxial germanium detector at a resolution of 1.33 MeV (FWHM) Is 1.97keV. The signal is amplified by a PGT RCB / 11C preamplifier and fed into the NAIG E-Series -4096 analyzer. Sampling: In order to obtain a highly active sample, a Japanese Missasa-spa spring water was collected, Carefully placed into four 2000ml well-type sample container with silicone tube at the inlet to prevent bubbling.Measurement: After the sample container was filled with water, the inlet and outlet were both sealed with resin and allowed to stand for three hours 222) Rn and daughter ~ (214) Pb up