A small quantity of a radioisotope or other substance added to a material in order to act as a tracer, reference, etc.
| 单词 | θ67949 |
| 释义 | the world > matter > chemistry > chemical reactions or processes > [noun] > substances involved in > spike (2) spike1959 A small quantity of a radioisotope or other substance added to a material in order to act as a tracer, reference, etc. Subcategories:— action of adding a (1) |
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