【摘要】 [目的]了解唐山市某高校办公大楼室内γ射线的剂量率、氡浓度及其影响因素,并估算人均年照射剂量。[方法]选择唐山市某高校办公大楼每层朝南和朝北方向的房间各1～2个,对室内地面和墙体的γ射线水平和空气中氡浓度进行测量。[结果]该办公楼地面和墙体的γ射线平均剂量率分别为(0.317±0.452)μGy/h和(0.192±0.263)μGy/h,室内氡浓度的平均值为9.43Bq/m3。室内地面γ射线剂量率在不同地面装修材料之间差异具有统计学意义(P﹤0.01),大理石地面的γ射线剂量率最高,其次为瓷砖地面,水泥地面最低。所估算的人均年照射剂量为1.72mSv·a-1。[结论]该办公大楼的放射性水平在安全范围内;地面铺设大理石增加室内γ射线水平。更多还原

【Abstract】 [Objective] To explore the indoor γ-ray dose rate, radon concentration and influence factors in an office building in Tangshan city, and estimate the per capita exposure dose in one year. [Methods] 1-2 offices of both sides (south and north) in each floor (2-4 floors) in an office building of a university in Tangshan city were selected. Indoor radon concentration, γ-ray dose rate of grounds and walls was measured respectively. [Results] The indoor average γ-ray dose rate of the grounds and the walls was 0.317±0.452 μGy / h and 0.192±0.263 μGy / h respectively. The mean of radon concentration was 9.43 Bq / m3. The average γ-ray dose rates of the grounds decorated different decorative materials (cement, marble, ceramic) were markedly different (P﹤0.01), and the marble ground was the highest. The annual per capita exposure dose was 1.72mSv·a-1. [Conclusion] The radioactive level of this office building and the annual per capita exposure dose are both safe. This study finds that the marble decorative materials may increase indoor radioactive level.更多还原