background radioactivity

常見例句

雙語例句

• At the surface, radioactivity of the conglomerates is locally as high as 30 X background.
  在地表， 礫巖的局部地段的放射性高達30倍本底值。
• The results showed that the radioactivity levels of each nuclide in Yangtze River water system were still lower than that of background, and did not cause contamination.
  結(jié)果表明，各核素均未對長江造成污染，長江水系放射性濃度仍在本底水平。
• The results show that the radioactivity level of varied water bod-ies of the city was within normal natural background.
  調(diào)查結(jié)果表明，上海市各類水體中天然放射性核素濃度屬正常本底水平。
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