| 单词 | calcium-45 | 
| 释义 | calcium-45 [`kal·sē·ǝm ´fȯrd·ē`fīv]  NUCLEAR PHYSICS A radioisotope of calcium having a mass number of 45, often used as a radioactive tracer in studying calcium metabolism in humans and other organisms; half-life is 165 days. Designated 45Ca.  | 
	
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