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本文介绍了研究性重水反应堆改建后在辐射防护设施和管理方面的改进措施;及场所、环境辐射水平、个人剂量和放射性排放物的下降程度。改建后堆功率从10~4kw 增至1.5×10~4kw,而大厅、地下室和走廊的γ辐射水平,分别为改建前的15%、10%、和25%;放射性气溶胶排放量比改建前低1—2个数量级;废水排放量为改建前的25%;工作人员外照射最大年均剂量为年限制剂量当量的3.8%,仅为改建前的10—30%。
This article describes improvements in radiation protection facilities and management after the rebuilding of research heavy water reactors; and the extent to which sites, levels of environmental radiation, personal doses, and radioactive emissions decline. The reactor power increased from 10 ~ 4kw to 1.5 × 10 ~ 4kw after the rebuilding, while the γ radiation levels in the hall, basement and corridor were 15%, 10% and 25% respectively before the rebuilding; and the emission of radioactive aerosol was 1 to 2 orders of magnitude lower than the previous one; discharge of waste water is 25% of that before reconstruction; and the maximum average annual external dose exposure of workers is 3.8% of the annual dose equivalent, only 10-30% of that before the reconstruction.