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对某单位13台正在高速公路施工中使用的进口“核子仪”放射污染状况进行调查。结果表明,“核子仪”表面及外包装箱表面10cm辐射水平较高,为13811μSv·h-1和4029μSv·h-1,未发现由辐射源引起的放射污染,“核子仪”开启、关闭状态下1m直径处辐射水平较高,但随着距离的增大迅速减小,至5m距离时,已接近天然本底值。工作人员每完成一次测量操作,接受的剂量当量为020μSv,理论上每天操作不应大于70次,接近目前日均操作次数(765次d),“核子仪”携带所致的剂量当量为205mSva。由于管理粗疏和工作人员防护意识缺乏,所致意外照射较大,特别是放置于床下,年剂量当量可达15505mSva。
Conducted a survey on the radioactive contamination of imported “nuclear devices” used by 13 units of expressways under construction. The results showed that the “nuclear instrument” surface and the outer surface of the package 10cm higher radiation levels of 13811μSv · h-1 and 4029μSv · h-1, did not find the radiation pollution caused by the radiation source, “nuclear instrument” open, closed state Under the 1m diameter radiation level is higher, but decreases rapidly with increasing distance, to 5m distance, has approached the natural background value. Each time a staff member performs a measurement, the dose equivalent is taken as 020μSv. Theoretically, the daily operation should not be greater than 70, which is close to the current daily average number of operations (765 d). The dose equivalent caused by the “nuclear instrument” is 205mSva. Due to the lack of management awareness and lack of awareness of staff protection, the accidental exposure is large, especially under the bed. The annual equivalent dose can reach 15505 mSva.