Photon beam dosimetry at a blocked beam edge using diffusion approximation

I. J. Das, K. R. Kase, J. E. Kelley, B. L. Werner

Research output: Contribution to journalArticle

2 Scopus citations


A simple analytical model is presented for the transport of secondary electrons at a photon beam edge using the energy averaged solution of the Boltzmann equation, originally developed for beta -ray dosimetry at a plane interface. Dose at a point under a block is assumed to be due to secondary electrons and the scattered photons generated from the primary photon beam. The diffusion approximation is used for the secondary electron transport at a virtual plane interface created by the block. The dose from the scattered photon component is treated as decaying exponentially with distance from the beam edge. Comparisons made with the model and measurements are in general agreement for high energy accelerator beams.

Original languageEnglish (US)
Article number008
Pages (from-to)937-946
Number of pages10
JournalPhysics in Medicine and Biology
Issue number4
StatePublished - Jan 1 1992

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

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