TY - JOUR

T1 - The significance of electron binding corrections in Monte Carlo photon transport calculations

AU - Williamson, J. F.

AU - Deibel, F. C.

AU - Morin, R. L.

PY - 1984

Y1 - 1984

N2 - Many Monte Carlo simulations ignore coherent scattering events and utilise the Klein-Nishina free electron distribution, rather than the incoherent differential cross-section, for choosing the trajectories of incoherently scattered photons. The authors assess the accuracy of this model by comparing its results with those of the complete bound electron model (form factor approach), which simulates coherent scattering events, and uses the appropriate bound electron angular scattering distributions. Both analytic and Monte Carlo calculations demonstrate that use of the free electron scattering distributions significantly underestimates the angular distribution of scattered photon energy resulting from low and medium energy photons incident upon carbon, iron, and platinum barriers. In using the free electron approximations to calculate barrier transmission, significant errors occur only for primary photon energies below 100 keV. Implementation of the complete bound electron model reduces the computational efficiency of the authors' Monte Carlo code by only 10-25%.

AB - Many Monte Carlo simulations ignore coherent scattering events and utilise the Klein-Nishina free electron distribution, rather than the incoherent differential cross-section, for choosing the trajectories of incoherently scattered photons. The authors assess the accuracy of this model by comparing its results with those of the complete bound electron model (form factor approach), which simulates coherent scattering events, and uses the appropriate bound electron angular scattering distributions. Both analytic and Monte Carlo calculations demonstrate that use of the free electron scattering distributions significantly underestimates the angular distribution of scattered photon energy resulting from low and medium energy photons incident upon carbon, iron, and platinum barriers. In using the free electron approximations to calculate barrier transmission, significant errors occur only for primary photon energies below 100 keV. Implementation of the complete bound electron model reduces the computational efficiency of the authors' Monte Carlo code by only 10-25%.

UR - http://www.scopus.com/inward/record.url?scp=0021251340&partnerID=8YFLogxK

U2 - 10.1088/0031-9155/29/9/003

DO - 10.1088/0031-9155/29/9/003

M3 - Article

C2 - 6483972

AN - SCOPUS:0021251340

SN - 0031-9155

VL - 29

SP - 1063

EP - 1073

JO - Physics in Medicine and Biology

JF - Physics in Medicine and Biology

IS - 9

M1 - 003

ER -