青岛市天然放射性环境地质调查

对青岛地区进行了大规模的天然放射性环境地质调查和评价中发现,青岛地区陆地伽马辐射剂量率虽然略高于全国和山东省的平均水平,但仍属于天然辐射安全区域.测区的伽马辐射剂量率值总体上决定于岩性.伽马辐射剂量率都来自于²³⁸U、²³²Th、⁴⁰K的贡献,但是与其他地区不同,⁴⁰K和²³²Th对剂量率的贡献要大于²³⁸U.此外,一些公路、建筑等建造材料中的放射性核素的含量直接影响着这些工程的放射剂量,主要是在建造这些工程时所选用的石材、石料和水泥等,都会对当地的放射剂量有着重大的影响.

THE INVESTIGATION OF NATURAL RADIATION ENVIRONMENTAL GEOLOGY OF QINGDAO CITY

Investigation and evaluation of the natural radiation level of Qingdao City were conducted by Qingdao Institute of Marine Geology from 2003 to 2005. The radioactive level of Qingdao City remains within the safe range of the natural background level, although the average dosage rate of the terrestrial γ-radiation is slightly higher than that of the National and Shandong Province Standard. The level of the terrestrial γ-radiation seems on the whole controlled by the local rocks. The terrestrial γ-radiation results from ²³²Th, ²³⁵U and ⁴⁰K, while ⁴⁰K or/and ²³²Th contribute more to the terrestrial γ-radiation than ²³⁸U, which is different from things of the other areas. In addition, the amounts of radionuclide contained in such materials as masonry, cement and concrete used for many construction projects like roads and architecture affect the level of terrestrial γ-radiation of the construction projects.