calcium-45
Also found in: Dictionary, Thesaurus, Medical.
calcium-45
[′kal·sē·əm ‚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.