cee tee ee ee ented wy terse * - BIG LOGY AND MEDICINE . ‘ Cesium 137 isone of the most important ‘of the relatively.long-lived gammaradioisotopes, with a half-life of approximately 35 years. In additionto its medi this isotopehas.many applications in industry. ‘The demand is expected to reach _of curies, as the techniques for extracting cesium 137 from reactor wastes are reduced incost. * 7 . ofabout $29, 000. tea “At the presént cost of 14per curiefor cesium 137, ‘the newlyinstalled unit has Degen he deet Te SeATI AE, Pd ARES ITA ae atet tS ea ee oa UNCLASSIFIED - and its specificactivity is’24 curiesper gram of cesium 437. wn -oame, “During thepast year the Michigan group has been treating patients with c ¢on E tional: = x ray and. with a 1,903-curie cobalt source, the largest high-specific-activity co Ahis country.’' Acquisition of the cesium source completes the university’ s plann installation_ of high-energy sources for use in radiation therapy at this project.(Endof UNC uD. o = _o. a. -y ‘« Ks , - 7 f ._ i 2 * a Pe eo eat! . 4 t 7”. { nx f 38 . sha teontne an ots RRNA Ne end een name rei captatee ceingap ° apie eee aa Behe epee section.) one .~ a