含氚泵油放射性及其随时间变化研究初探

Preliminary study of the radioactive change of tritiated pump oil over the time

含氚泵油是含氚有机液物主要来源之一,其组分较复杂,往往采取集中收集密封保存的方式,其活度浓度也不清楚,采用内标法对含氚泵油的活度浓度进行了测量,并采用自制的密闭装置对氚泵油扰动下层液和挥发性组分收集测量,结果表明:测量条件需要避光保存4h以上,闪烁溶液的最佳加入量为5.0mL,甲苯稀释用量为5.0mL,该含氚泵油活度浓度在1010Bq·L-1的量级,活度浓度随测量时间及测量条件有所变化;经过实验过滤扰动泵油,其中的易挥发成分大多数在24h内会挥发出来,而真正以泵油中各种不易挥发组分表现的氚活度浓度约占12.6%,在常温密闭条件下与泵油中各种组分结合,不会短时间内大量挥发,但其挥发表现为随温度的升高而上升的趋势。

The component of tritiated pump oil is complex, so it was often taken sealed and stored centrally. The radioactivity over time is unclear;In the study, the activity concentration of the tritiated pump oil was measured directly and indirectly, at the same time measured regularly at each month in one year. The oil stirred and volatile components collected through the airtight device self- designed, measured the radioactivity. The results showed that： the activity concentration of the tritiated pump oil was 10^10Bq·L^-1 magnitude. At the room temperature a large number of the sealed oil through short period of time would not volatile. The initial activ- ity of disturbance pump oil reduced maximally in the first month, but in one year, a total of about 12. 6% of the tritium volatized, vol- atile components of pump oil containing tritium would evaporate out in 24h