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Off‐axis x‐ray spectra: A comparison of Monte Carlo simulated and computed x‐ray spectra with measured spectra
Author(s) -
Bhat Madhava,
Pattison John,
Bibbo Giovanni,
Caon Martin
Publication year - 1999
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 - 10.1118/1.598517
Subject(s) - spectral line , bremsstrahlung , monte carlo method , x ray , physics , spectrometer , computational physics , materials science , atomic physics , optics , photon , statistics , mathematics , astronomy
The off‐axis x‐ray spectra from a constant potential x‐ray generator were measured with a high purity germanium spectrometer cooled to liquid nitrogen temperature. The measured spectra were compared with off‐axis x‐ray spectra calculated using a code based on the semiempirical model developed by Tucker et al. and Monte Carlo simulated x‐ray spectra using the EGS4 code system. In this study, both the Tucker model, and the EGS4 code system, were found to produce off‐axis bremsstrahlung x‐ray spectra which agreed well with the spectra measured at three emerging angles. In the measured and the EGS4 generated spectra the total K ‐characteristic peaks were in increasing order, as observed in the anode to cathode direction, whereas the Tucker model produced maximum total K ‐characteristic peaks at the 6° anode side, and lesser amounts at the central axis and the 6° cathode side. Large differences in the total K ‐characteristic lines is seen among the three different methods. The EGS4 code system was able to produce x‐ray spectra for a combination of target materials.