第三十五条 国家对放射源、射线装置实行分类管理，具体分类办法由国务院有关部门制定。
An ice-core record of hydrogen reveals that atmospheric levels vary in response to climate change and have increased drastically owing to human activity since the pre-industrial era. The apparent sensitivity of hydrogen cycling to environmental conditions should be considered when projecting the consequences of rising anthropogenic hydrogen emissions in a warming climate.，详情可参考一键获取谷歌浏览器下载
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I found this article on the subject, and decided to turn that data into a visualization, too.