On calculating kerma, collision kerma and radiative yields

Medical Physics
D W O Rogers, Reid W Townson

Abstract

To study the relationships between dose (D), kerma (K), and collision kerma ( K col ) in photon beams and to investigate total radiative yields for electrons and positrons as a function of energy. To do this accurately required calculating collision kerma directly as a function of position in a phantom and making changes to the EGSnrc package (including DOSRZnrc and g applications). Changes were made to the EGSnrc system to allow the user to distinguish events according to their initiating process, most importantly relaxation particles initiated by electron impact ionization as opposed to initiated by photons, especially those events depositing energy below energy cutoffs after relaxation events. Appropriate changes were made to the applications DOSRZnrc and g and a new application, DOSRZnrcKcol, was written. The modified codes are much more robust against changes in simulation parameters such as ECUT and AE and whether or not electron impact ionization is included in the simulation. The radiative yields for electrons generally differ from values in ICRU Report 371 (1984) which only account for radiative losses due to bremsstrahlung. The Monte Carlo calculated g(brems) values are generally greater than the ICRU 37 values du...Continue Reading

References

Mar 1, 1979·Health Physics·F H Attix
Dec 10, 1999·Medical Physics·G M MoraD W Rogers
Sep 13, 2018·Physics in Medicine and Biology·Pedro Andreo, Hamza Benmakhlouf

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Citations

Jan 28, 2020·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·Abdullah Abuhaimed, Colin J Martin
May 22, 2020·Medical Physics·Habib SafigholiRowan M Thomson

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