Using the unified model for calculating energy absorbed fractions from incorporated emitters of monoenergetic electrons and photons in bio-objects composed from various materials

Abstract

A technique was developed to extending the methodology of analytical estimations of absorbed fractions to the case of spherical bio-objects composed from various materials. The internal source of exposure was emitter of monoenergetic photons or electrons uniformly distributed throughout the object’s volume. Analytical results were tested, using published sets of Monte Carlo data on spheres composed from bone tissues, lung tissues, soft muscle tissues and water. Existence of ‘universal curves’ for rescaled absorbed fractions, which combine Monte Carlo data on various materials was confirmed for monoenergetic electrons and photons. Analytical results are in adequate agreement with Monte Carlo data on each biomaterial. Advantage of the unified method is the express calculating of radiation absorbed fractions without employing complicated Monte Carlo codes, and numerous interpolating procedures. The extension of the methodology to various materials provides new opportunities for internal dosimetry of living organisms, including assessment of doses to different organs and tissues.