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Polynomial and power law of central axis backscatter factors for external and γ‐ray sources
Author(s) -
Tsung Peinan
Publication year - 1976
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 - 10.1118/1.594242
Subject(s) - polynomial , backscatter (email) , power law , mathematics , degree (music) , beam (structure) , quality (philosophy) , dosimetry , power (physics) , optics , physics , mathematical analysis , statistics , computer science , telecommunications , quantum mechanics , nuclear medicine , medicine , acoustics , wireless
A third‐degree polynomial and power‐law analysis with the method of least‐squares fit are computed for backscatter factor with a continuous variation of field size and different beam quality of radiation from 1.0‐mm Al external x ray to 60 Co γ ray. Three coefficients are required for a third‐degree polynomial and two coefficients for power law method of each beam quality.