退役氚污染不锈钢材料中氚污染深度和化学组成

Tritium Distribution and Forming in Decommission Stainless Steel

明确待退役氚污染不锈钢材料中氚污染深度和化学组成,对制定和选择经济有效的退役处理工艺或方法具有重要意义。分层化学蚀刻法是研究氚污染不锈钢材料中氚深度分布及存在形态的主要方法之一。研究过程中,从待退役氚工艺线上取氚污染的不锈钢材料,制成实验试样后,采用常温化学分层蚀刻方法对试样中的氚污染深度和氚的化学组成进行实验研究。结果表明,氚聚集在不锈钢表面层0～4μm范围内,主要以HTO和HT形式,其中HTO占90%以上,且随着表层深度的增加,HT含量占比逐渐增大,直至与HTO含量接近。

The distribution and the forming of the tritium in the surface layer of the stainless steel which would be decommissioned were studied using chemical etching. The samples are the real tritium pollution stainless steel coming from the decommissioning tritium facility. The most of the tritium gathers in the surface of the samples, in the range of 0-4 μm. The forming of tritium in the samples are HTO and HT, and the content of HTO is more than 90%. The deeper the tritium is in the surface, the more content of HT until it closes to the content of HTO.