title: Letter: Siemens teletherapy caesium unit.
mesh_terms: D002587:Cesium Isotopes / Q000627:therapeutic use*; D011867:Radioisotope Teletherapy / Q000295:instrumentation*; D011868:Radioisotopes / Q000627:therapeutic use*; D011879:Radiotherapy Dosage
chemical_list: D002587:Cesium Isotopes; D011868:Radioisotopes