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单词 non-radioactive
释义

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non-radioactive
non-radioactive adj.
Brit. /ˌnɒnreɪdɪəʊˈaktɪv/
,
U.S. /ˌnɑnˌreɪdioʊˈæktɪv/
not radioactive; not involving the use of radioactive substances.
ΚΠ
1904 E. Rutherford Radio-activity 397/2 Preparation of non-radio-active thorium.
1937 Discovery Apr. 127/1 An isotope of a non-radioactive element.
1978 J. A. Maxwell America's Fascinating Indian Heritage i. 19/1 At death, the intake of C-14 ceases and the accumulated supply in the body begins to break down into nonradioactive carbon.
1993 Ann. Human Genetics 57 1 A 317-bp segment of DNA from the 3′ region..has been examined by a non-radioactive technique.
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