亚洲欧美日韩产国黄片_A级无码视频在线观看_AV片亚洲国产男人的天堂_久久综合精品无码久久综合_精品日产一区二区_国产精品二区三区免费播_黄色视频在线播放网页_日韩在线高清_国产麻豆剧果冻传媒北上广_黄A一级视频免费

Nuclear radiation has been widely used in the field of nuclear technology, for example: material thickness measurement or defect detection, nuclear medicine, radiation breeding, radiation imaging, etc., the list goes on. There are many kinds of radiation sources in the application of nuclear technology, including a single type of radiation source that emits a particle, b ray, g ray or neutron, and a combination of these types of radiation sources. Therefore, shielding design needs to be targeted according to the type and intensity of the radiation source.