Teletherapy design problems.
D002586:Cesium; D002588:Cesium Radioisotopes; D003035:Cobalt; D003037:Cobalt Radioisotopes; D006801:Humans
D002588:Cesium Radioisotopes; D003037:Cobalt Radioisotopes; D002586:Cesium; D003035:Cobalt
CESIUM/radioactive; COBALT/radioactive