(from the article `ion-exchange reaction`) ...some commercially. They are useful in the nuclear power industry for they are resistant to radiation and selective to certain radioactive wastes, ... Radioisotopes that are absorbed and distributed evenly throughout the body also can result in whole-body irradiation. Examples are tritium and...
<radiology> Cs-137, energy: 662 keV (near Mo-99), half-life: 30 years ... (12 Dec 1998) ... 
[n] - a radioactive isotope of cesium used in radiation therapy
noun a radioactive isotope of cesium used in radiation therapy