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On absorbed dose in narrow 60 Co gamma‐ray beams and dosimetry of the Gamma Knife
Author(s) -
Nizin Paul S.
Publication year - 1998
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 - 10.1118/1.598444
Subject(s) - dosimetry , absorbed dose , collimator , gamma ray , imaging phantom , physics , radius , nuclear medicine , radiation , optics , nuclear physics , medicine , computer science , computer security
Using separate analytical functions describing primary dose, P 0( d m , r ) , collimator scatter, S c( r ) , and phantom scatter, TAR ( d , r ) , an expression for absorbed dose in narrow60 Co gamma‐ray beams is developed and each function is quantified:D ( d , r ) = P 0( d m , r )S c( r )TAR ( d , r ) . The absorbed dose is calculated in beams as narrow as 0.2 cm in radius. Analytical and experimental results are compared using measured dose data for the Gamma Knife. Close agreement with experimental data is observed.