Attenuation of primary and scatter radiation in concrete and steel for 18 MV X-rays from a Clinac-20 linear accelerator.
With the increasing number of high-energy linear accelerators being installed in radiation-therapy facilities, an increasing need exists for carefully measured data concerning the shielding parameters of photon radiation in the energy range above 10 MeV. In this study, the 18 MV X-ray beam from a Varian Clinac 20 linear accelerator was employed. Transmission parameters were measured for the primary X-ray beam in concrete and steel. The tenth value layer for steel was 11.3 +/- 0.6 cm and for concrete 45.0 +/- 2.0 cm. Also measured were the transmission parameters for scattered radiation vs angle in concrete and steel.
D003252:Construction Materials / Q000592:standards*; D010315:Particle Accelerators; D011835:Radiation Protection / Q000592:standards*; D011882:Radiotherapy, High-Energy; D012542:Scattering, Radiation; D013232:Steel
D013232:Steel