radiocalcium

ra·di·o·cal·ci·um

(rā'dē-ō-kal'sē-ŭm), A radioisotope of calcium, particularly calcium 45.

radioactive calcium

Any of the radionuclides of calcium, the most common of which are the beta-emitting 45Ca, which has a half-life of 163 days, and the beta and gamma-emitting 47Ca, which has a half-life of 4.5 days and has some currency as a tracer for calcium metabolism studies.

radiocalcium

(rā″dē-ō-kăl′sē-ŭm) A radioisotope of calcium; 45Ca and 47Ca are used in medical studies.