包头医学院室内环境γ辐射水平监测与评价

Monitoring and Assessment of Indoor Environmental γ Radiation Level in Baotou Medical College

目的:通过对包头医学院新校区教学楼、办公楼和公寓楼室内γ辐射水平的监测,评价新校区室内环境γ辐射水平的安全性。方法:以解剖楼、行政楼、教学楼、公寓楼、图书馆和1号实验楼的室内环境为监测对象,每座楼随机抽选10个办公室(或宿舍),阴阳面各5间,同时将相应楼层的走廊也作为监测对象;依据室内面积设置监测点位数,采用GH-102A型环境γ剂量率仪监测各点位的γ辐射剂量值。结果:包头医学院新校区各类用房室内环境γ辐射剂量率除图书馆走廊在0.18～0.76μGy/h之间外,大部分在0.12～0.29μGy/h之间;图书馆走廊有8个监测点位的γ辐射剂量率超过了《放射卫生防护基本准则》规定的限量值,最大值超标0.33倍;不同类别用房室内环境的γ辐射剂量水平间差异无统计学意义(P>0.05)。结论:包头医学院新校区所有用房室内γ辐射剂量率符合卫生标准要求,图书馆走廊虽然有8个点位超标,但超标倍数很小,且师生在这些点位停留时间短暂,所以就γ辐射水平而言是安全的。

Objective： To evaluate the safety of indoor environmental γ radiation in new campus by monitoring γ radiation level of indoor environment in teaching buildings,office buildings and apartment buildings in Baotou medical college.Methods： 10 office or dorms（5 rooms are located on the nightside,the other 5 rooms are located in positive side） and corridors outside of each room were randomly selected as monitoring objects.The number of monitoring objects is set in accordance with the size of the indoor area.The γ radiation dose value was monitored in monitoring sites with GH-102A-type environment γ dose rate meter.Results： Most of the radiation dose values of indoor environment in all kinds of new campus buildings are at 0.12~0.29 μGy / h,except for the library corridor at 0.18~0.76 μGy / h.The γ radiation dose rate of eight monitoring sites in library corridor was above the limited value provided by ＂Basic Norms of Radiation Protection＂,with the maximum value 0.33 times higher than the limited value;there is no significant difference in the level of environmental γ-radiation dose among various rooms（P 0.05）.Conclusion： The indoor γ radiation dose rate of all new campus buildings in Baotou Medical College were in line with health standards,although the γ radiation dose rate of eight points in the library corridor exceeds the standard value,but the excessive multiple is small,moreover,the time when teachers and students stay at these locations is short,so long-term exposure to such levels of γ radiation is safe.