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使用红外炉发展了一种从活化混凝土中提取氚的方法。通过研究氚的提取效率与加热温度、加热时间的关系,获得了氚的提取优化条件为在800℃下加热30 min,Ar气流量设置为200 mL/min。氚由两个冷凝管收集,然后装到1个小玻璃瓶中,与液体闪烁体混合,使用液体闪烁计数器计数。使用这种方法提取氚只需55 min。相对于使用电子炉提取氚的方法,氚的提取效率可达到100%。收集了两个加速器屏蔽体中的混凝土样品,测量了样品中的γ射线核素和氚的放射性比活度。结果显示,氚的比活度与152Eu和60Co的比活度有很强的相关性。可得出结论:氚主要产生于热中子俘获反应6Li(n,α)3H。因而,可使用60Co的放射性比活度简单估计活化的混凝土样品中氚的放射性比活度。
An infrared furnace was used to develop a method for extracting tritium from activated concrete. By studying the relationship between the extraction efficiency of tritium and the heating temperature and heating time, the optimal extraction conditions of tritium were obtained by heating at 800 ℃ for 30 min and Ar gas flow rate at 200 mL / min. Tritium was collected by two condenser tubes, then placed in a small glass vial, mixed with a liquid scintillator and counted using a liquid scintillation counter. Triton extraction is only 55 min using this method. Tritium extraction efficiency can reach 100% relative to the method of extracting tritium using an electronic furnace. Concrete samples from two accelerator shields were collected and the radioactivity of gamma rays and tritium in the samples was measured. The results showed that the specific activity of tritium has a strong correlation with the specific activity of 152Eu and 60Co. It can be concluded that tritium is mainly produced by thermal neutron capture reaction 6Li (n, α) 3H. Thus, the radioactivity specific activity of tritium in an activated concrete sample can be simply estimated using the radioactivity of 60Co.