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Backscatter into the beam monitor chamber: Implications for dosimetry of asymmetric collimators
Author(s) -
Duzenli C.,
McClean B.,
Field C.
Publication year - 1993
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 - 10.1118/1.597077
Subject(s) - dosimetry , linear particle accelerator , collimator , backscatter (email) , beam (structure) , optics , physics , field size , nuclear medicine , ionization chamber , particle accelerator , medical physics , computer science , medicine , telecommunications , ion , quantum mechanics , wireless , ionization
Backscatter from the asymmetric collimators of a linac into the beam monitor chamber (BMC) has been investigated for two accelerators having different BMC configurations. The effect has been quantified as a function of field size and collimator jaw position for 6 and 18 MV beams. The results indicate a maximum 2.5% (6 MV) and 4% (18 MV) decrease in output in one case and a negligible effect in the other case. The experiments indicate that the difference can be attributed to the different construction of the BMC's for the two accelerators.