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Constancy of spectral quality across large fields from Clinac‐4 and Clinac‐6 accelerators
Author(s) -
Nath Ravinder,
Rivera Carlos
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 - 10.1118/1.594998
Subject(s) - dosimetry , field (mathematics) , quality (philosophy) , irradiation , field size , sensitivity (control systems) , quality assurance , linear particle accelerator , optics , materials science , nuclear medicine , physics , nuclear physics , medicine , beam (structure) , mathematics , quantum mechanics , electronic engineering , pure mathematics , engineering , external quality assessment , pathology
Spectral quality at different locations across a 40×40 cm 2 field and on the central‐axis for different field sizes from Clinac‐4 and Clinac‐6 accelerators has been measured using the photoactivation ratio method. This method is based on a measurement of the ratio of photoactivation rates induced by 115 In(γ,γ′) and D(γ, n )× 115 In( n ,γ). Despite the high sensitivity of this technique, no significant variation of spectral quality across the irradiation field in air and for different field sizes on the central‐axis is observed.