title: Dose in the buildup region outside the primary beam.
abstract: The dose received in the buildup region outside the primary beam has been measured for 60Co gamma rays and 6- and 18-MV X rays. The variation of this dose with field size and depth was evaluated. The effect of blocking trays and the importance of their design was determined.
mesh_terms: D003037:Cobalt Radioisotopes / Q000627:therapeutic use*; D006801:Humans; D010315:Particle Accelerators; D011867:Radioisotope Teletherapy; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy
chemical_list: D003037:Cobalt Radioisotopes