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采用酸液蚀刻法和液体闪烁计数法测量了在 6 73K和 1 0 1 3K下分别充氚 8h、室温空气中时效 1～ 3a后 ,31 6L型和 2 2 1 3 5型不锈钢圆柱样品中氚浓度的分布。运用扩散方程的有限差分数值解法 ,计算了样品中氚和氦 3的体浓度分布 ,结果与实验结果符合较好。研究结果表明 ,室温时效期间 ,氚在不锈钢中的扩散缓慢 ,主要通过衰变成氦 3后发生浓度变化 ;由于氧化层的影响 ,表面附近的氚只是部分逸出 ;样品中存在“固溶”和“非固溶”两种形式的氚 ,前者所占份额较小 ,蚀刻时进入溶液 ,后者所占份额较大 ,为缺陷俘获 ,以分子或多个原子簇的形式存在 ,蚀刻时以气体形式释放。
The acid etching method and liquid scintillation counting method were used to measure the tritium in 31 6L and 2 2 1 3 5 stainless steel cylinder samples after deuterium trituration at 673K and 1 013K for 8h and room temperature air aging for 1 ~ 3a respectively. Concentration distribution. Using the finite difference numerical solution of the diffusion equation, the body concentration distributions of tritium and helium 3 in the sample were calculated. The results are in good agreement with the experimental results. The results show that tritium diffuses slowly in stainless steel during room temperature aging, and mainly changes in concentration after decay into helium 3. Because of the influence of oxide layer, tritium only partially escapes in the sample. There is “solid solution” And “non-solution” two forms of tritium, the former share of the smaller, into the solution when etching, the latter a larger share of defect capture, in the form of molecules or clusters of atoms, the etching time Gas released.