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Unwanted radiation produced by leakage neutrons from medical electron accelerators
Author(s) -
Ing H.,
Shore R. A.
Publication year - 1982
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595067
Subject(s) - imaging phantom , monte carlo method , photon , scattering , physics , neutron , radiation , electron , dosimetry , cathode ray , leakage (economics) , linear particle accelerator , beam (structure) , nuclear physics , nuclear medicine , atomic physics , optics , medicine , mathematics , statistics , economics , macroeconomics
Monte Carlo calculations have been made to determine the energy delivered to a phantom by neutrons escaping from the head of a Varian Clinac 35 medical accelerator at an SSD of 1 m. The energy was sorted into two regions: inside and outside a volume defined by a circular beam of area 100 and 600 cm 2 . For the two beam sizes, the energies outside the treatment volume were 12 and 8.7 g‐rad (per photon rad) respectively. Room scattering increased these values by about 20%. These energies are smaller than those delivered by scattered photons by more than ten times.