Radiation field from a large cylindrical source

Extended gamma sources modelling using multipole expansion: Application to the Tunisian gamma source load planning

“…To achieve such operation, methods ranging from time-consuming Monte Carlo simulation (Oliveira et al, 2000;Saylor and Jordan, 2000) to mathematical models (Curzio and Allignant, 1996;Proykova et al, 1991;Winkler, 1985) are in use. Usually, in the context of radiation technology, the mathematical model is expected to calculate and predict the dose distribution taking into consideration the geometry of the problem and appropriate material constants.…”

“…Furthermore, while the buildup factor and the attenuation effects were well investigated in the literature, little work was done about the systematic influence of the source extension. However, except for few simple cases, exact mathematical description of the radiation profile from extended sources is generally not easy to obtain (Curzio and Allignant, 1996;Proykova et al, 1991;Timus et al, 2005). Therefore, for some special purposes we suggest to use an approximation method based on multipole expansion to allow analytical description of the radiation profile.…”