摘要
天然水中氚含量很低,一般采用电解浓缩-液闪计数法进行测量。电解水样时,氚的电解回收率可由水样的浓缩倍数和氚分馏系数来确定。而电解过程的氚分馏系数和氘分馏系数存在一个近似的关系,即lnβ=ηlnα。采用氚标准水进行电解实验,可得到氚分馏系数,采用光腔衰荡激光同位素法测量电解前后的氘含量可以获得氘的分馏系数。电解条件为低碳钢-镍电极装置,以Na2O2为电解质,电解过程温度为0.5℃。实验得到η为1.27。在电解水样时,可根据lnβ=1.27 lnα可得到氚分馏系数,从而获得本批次每个水样的电解回收率。
Electrolytic enrichment liquid scintillation counting is the main method to measure the tritium in natu- ral water since its low level tritium activity. When a batch of samples for tritium in water was enriched in elec- trolysis ceils, the tritium recovery is determined by enrichment factor and separation factor. Data for deuterium and tritium separation factors show close adherence to a linear relationship,1nβ=ηlna. The tritium separa- tion factor is attained by the experiment of electrolysis of tritium standard water, and the deuterium separation factor is determined by cavity ring - down method. The consistent 7/is 1.27 when it is used steel - nickel cell, Na2O2 as Electrolyte, and temperature is 0.5 ℃. According to the relationship of 1nβ= 1.27 In a, the tritium separation factor and the tritium recovery of natural water samples are attained.
出处
《核电子学与探测技术》
CAS
北大核心
2016年第3期321-324,共4页
Nuclear Electronics & Detection Technology
基金
国家自然科学基金(41102151)资助
关键词
氘
氚
电解
分馏系数
deuterium
tritium
electrolysis
separation factor
