title: Water calorimetric determination of absorbed dose by 280 kVp orthovoltage X-rays.
abstract: The absorbed dose to water from 280 kVp orthovoltage X-rays was determined by a water calorimeter and compared with that determined by an ionization chamber. X-ray qualities of three different filtrations were investigated: they were characterized by 0.57, 0.695 and 1.76 mm of copper half value layers (HVL). The absorbed dose determined by the calorimeter is found higher by 7-9% than that by an ionization chamber. This difference was greater by 4% than that observed for a 60Co beam with the same two detectors.
mesh_terms: D002151:Calorimetry / Q000379:methods*; D003037:Cobalt Radioisotopes / Q000627:therapeutic use; D006801:Humans; D009369:Neoplasms / Q000532:radiotherapy*; D011874:Radiometry / Q000379:methods*; D011879:Radiotherapy Dosage
chemical_list: D003037:Cobalt Radioisotopes