The unwelcome discovery prompted Naoto Kan, the prime minister, to issue a new safety standard for levels of radioactivity in marine products.
这个不受欢迎的发现促使首相菅直人发布了新的关于海产品放射性水平安全的标准。
The results have been checked with the reference standard material for environment radioactivity provided by NBS, USA.
用NBS提供的环境放射性标准参考物质进行了检验。
Three samples consisted of standard or quasi-standard substances with known specific activities of some nuclides while the radioactivity of the other sample was unknown.
该比对中的三种样品是由一些具有已知核素比活度的标准物质或准标准物质构成，而另一种是活度未知的盲样。
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