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31.
任何放射工作单位中的新建、改建、扩建放射工作场所（以下简称建设项目）的放射防护设施都必须与主体工程同时设计审批、同时施工、同时验收使用,这在《中华人民共和国职业病防治法》、国务院令第44号《放射性同位素与射线装置放射防护条例》、卫生部令第17号《放射工作卫生防护管理办法》等法律、法规中均有明确的规定,可在现实工作中,有些单位并未认真遵照执行。 相似文献
32.
Four sediment cores were collected from Mikawa Bay, Japan, and excess 210Pb and 137Cs were measured by gamma spectrometry. Sedimentation rates for the four cores were determined by 210Pb method. The sedimentation rate range is 0.10-0.70 g/(cm2·year). The bio-mixing depth for each core is less than 7.0 cm, and was determined by the excess 210Pb profiles as well. Therefore, the bioturbation is slight. The 210Pb-derived dates coincided with the results from 137Cs geochronology. Acceleration in sedimentation ra... 相似文献