“specific activity”的概念、定义、翻译、参考文献-科学参考

单词	specific activity
释义	specific activity [spǝ`sif·ik ak`tiv·ǝd·ē] ^NUCLEONICS 1. The activity of a radioisotope of an element per unit weight of element present in the sample. 2. The activity per unit mass of a pure radionuclide. 3. The activity per unit weight of a sample of radioactive material.In these three cases, specific activity can be expressed in such units as millicuries per gram, disintegrations per second per milligram, or counts per minute per milligram.
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