真空电子束焊机辐射水平调查与豁免分析

Radiation level survey and exemption analysis of vacuum electron beam welder

目的检测真空电子束焊机辐射水平,并对其进行放射性豁免分析,为真空电子束焊机是否纳入辐射安全豁免管理提供依据。方法首先,用451P巡测仪在距真空电子束焊机外表面10 cm处进行辐射水平巡测,以发现高水平辐射区;然后定点检测发现的高水平辐射区、真空室门外、观察窗外、真空室壁外、电子枪外和真空室顶部电缆通过处以及焊接工作人员操作位和人员经常活动位置的辐射水平。结果真空电子束焊机外10 cm处、焊接工作人员和公众活动区域的辐射水平接近本底辐射水平。结论真空电子束焊机正常运行时,不致于对放射工作人员和公众的健康与安全造成影响。符合豁免条件的真空电子束焊机可予以放射性豁免。

[Objective]To measure the radiation level of vacuum electron beam welder,to analyze its radioactive exemption,and provide evidence for whether vacuum electron beam welder should be included in radiation safety exemption management.[Methods]First of all,451P survey meter was used to survey the radiation level of vacuum electron beam welder at a distance of 10cm out of surface,in order to find the high level radiation zone.Then,the fixed-point detection was performed on the high level radiation zone,the vacuum chamber room outside,the observation window,the wall of the vacuum chamber,electronic gun outside and the top of the vacuum chamber where cable laid,welding operation posts and workers＇ activities location for radiation levels.[Results] Radiation levels at 10 cm out of vacuum electron beam welder and public activity areas were close to the level of background radiation.[Conclusion]The normal operation of vacuum electron beam welder can not affect the health and safety of radiation workers and the public population.The vacuum electron beam welder which meets the exemption conditions can be authorized for radioactive exemption.