【摘要】 采用点核积分方法计算了广东大亚湾核电站周围建筑物对地面沉积源的屏蔽因子。计算中考虑了地面沉积源、外墙沉积源及屋顶沉积源对室内计算点剂量的贡献 ,还考虑了用 0 .5MeV、0 .75MeV、1 .2 5MeV三组能量光子分别代表软、中、硬三类光子。计算结果给出了一层尖顶建筑物、老式二层楼房、新式三层楼房和多层大型办公楼房对平面沉积源的屏蔽因子推荐值分别为 0 .2 2、0 .1 5、0 .1 0和 0 .0 3 ,文中对外墙厚度、门窗面积与外墙总面积之比例及光子能量对屏蔽因子的影响进行了讨论更多还原

【Abstract】 A point kernel integrated technique is adopted to calculate the shielding factors afforded by buildings against a surface deposited radioactivity for the surrounding area of Guangdong Daya Bay Nuclear Power Station. In calculations, the contribution from radioactivity deposited on the ground, outer wall and roof to the dose received by a indoors reference point is considered. Three sets of photon with energy of 0.5 MeV, 0.75 MeV and 1.25 MeV are selected as representatives of photons with low, medium and high energy. Calculation results show that a set of shielding factors 0.22, 0.15, 0.10 and 0.03 are suitable for surface deposited radioactive sources for the houses with one storey, old style two storey, new style three storey and tower, respectively. The effect of following three parameters on shielding factor is discussed, i. e., thickness of wall, the ratio of between window area and outer walls area, photon energy.(更多还原