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Exposure rate constants for filtered 192 Ir sources
Author(s) -
Glasgow Glenn P.
Publication year - 1981
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 - 10.1118/1.594997
Subject(s) - analytical chemistry (journal) , reaction rate constant , spectroscopy , materials science , radiochemistry , chemistry , nuclear medicine , atomic physics , physics , kinetics , medicine , chromatography , quantum mechanics
The exposure rate constant, Γ δ was recently calculated to be 4.69±0.05 R cm 2 h −1 mCi −1 (9.09×10 −19 C kg −1 m 2 s −1 Bq −1 ) for an unfiltered point source of 192 Ir. Using that same nuclear spectroscopy data filtered exposure rates constants have been calculated for encapsulated sources produced by two commercial manufacturers. For a 0.3 mm diam. spherical source with a 0.1 mm core of 25% Ir and 75% Pt encased in a sheath of 0.1mm 100% Pt, the calculated filtered exposure rate constant is 4.30±0.10 R cm 2 h −1 mCi −1 (8.33×10 −19 C kg −1 m 2 s −1 Bq −1 ). For a 0.5 mm diam. spherical source with 0.1 mm diam. core of 25% Ir and 75% Pt encapsulated in 0.2 mm stainless steel, the calculated filtered exposure rate constant is 4.45±0.10 R cm 2 h −1 mCi −1 (8.62×10 −19 C kg −1 m 2 s −1 Bq −1 ). Calculational details are presented.