EXPERIMENTAL DETERMINATION OF DOSE CONVERSION COEFFICIENTS FOR EXTERNAL RADIATION EXPOSURE WITH GAMMA EMITTING RADIONUCLIDES

Abstract

In the present paper an Alderson RANDO phantom have been used to experimentally determine conversion coefficients for external exposure. A limited number of exposure situations were investigated: rotational geometry with different radiation point sources (99mTc, 131I+133Ba, 137Cs, 60Co), APand PA-geometry with 137Cs and a special pocket-geometry with 137Cs. All experiments were carried out on a large open field to avoid scattering effects from walls and roof. The established conversion coefficients are a first step to later determine more conversion coefficients for more complex exposure situations. The coefficients presented here may therefore be used directly or as a comparison to Monte Carlo simulated values of the same exposure situations.

Keywords

• внешнее облучение
• коэффициенты перехода
• эффективная доза
• геометрии облучения фантома