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A simple derivation of N gas , a correction in A wall , and other comments on the AAPM Task Group 21 protocol
Author(s) -
Attix F. H.
Publication year - 1984
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 - 10.1118/1.595565
Subject(s) - task group , simple (philosophy) , protocol (science) , physics , group (periodic table) , mathematics , medicine , quantum mechanics , engineering , philosophy , epistemology , engineering management , alternative medicine , pathology
The new AAPM Task Group 21 dosimetry protocol is a useful document that will no doubt result in improved accuracy in radiotherapy beam standardization when it is generally understood and widely adopted. It does however, require some “debugging.” The present paper clarifies the derivation of N gas , points out an error in the A wall data, and discusses the impracticality of applying the gradient approach in correcting for ion chamber perturbation of dose in phantoms irradiated by electron beams.