Application of NaI(T1) Scintillation Detector to Measurement of Tritium Concentration
Application of NaI(T1) Scintillation Detector to Measurement of Tritium Concentration
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NaI(T1)闪烁探测器在氚浓度测量中的应用
DOI：
10.3327/jnst.14.705
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
M. Shinagawa
中科院分区：
文献类型：
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作者：
K. Nishizawa;Yoshiomi Endo;M. Shinagawa
用普通NaI（T1）闪烁计数器探测氚衰变产生的韧致辐射，成功地测量了各种介质中的氚浓度。为了区分有意义的信号与主要由光电管中存在的热电子发出的噪音，通过电子电路来区分上升时间的差异，而不是通过脉冲高度分析来分离。这种脉冲形状的计数器成功地将多道分析器中低于18 keV的噪声计数从100cpm降低到4cpm，从而允许直接计数稀释至1 μCi/ml的氚化水，而不需要任何复杂的制备。
Measurements of tritium concentration in various media have been successfully performed by detecting with an ordinary NaI(T1) scintillation counter the bremsstrahlung emitted from tritium decay. To distinguish meaningful signals from noises emanating mainly from thermoelectrons present in the phototube, differences in rise time were discriminated by means of an electronic circuit, instead of separation by pulse height analysis. This pulse-shape discriminator successfully reduced noise counts below 18 keV in a multichannel analyzer from 100 cpm to 4 cpm, which permitted direct counting of tritiated water as dilute as 1 μCi/ml, without requiring any complicated preparation.