| 单词 | K-A decay |
| 释义 | K-A decay [`kā`ā di´kā] NUCLEAR PHYSICS Radioactive decay of potassium-40 (40K) to argon-40 (40A), as the nucleus of potassium captures an orbital electron and then decays to argon-40; the ratio of 40K to 40A is used to determine the age of rock (K-A age). |
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