A caesium 137 teletherapy unit for use at a source-to-skin distance of 35 cm.
D002586:Cesium; D002588:Cesium Radioisotopes; D006801:Humans; D011851:Radioactivity; D011878:Radiotherapy / Q000295:instrumentation*
D002588:Cesium Radioisotopes; D002586:Cesium
CESIUM/radioactive; RADIOTHERAPY/apparatus and instruments