4.4 Article

Characterization of the radiation field surrounding the Leksell Gamma Knife® and shielding applications

Journal

APPLIED RADIATION AND ISOTOPES
Volume 198, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apradiso.2023.110839

Keywords

Gamma Knife Perfexion; HPGe detector; Monte Carlo simulation; Structural shielding design

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The aim of this study is to improve the characterization and modeling of the radiation field surrounding the Leksell Gamma Knife & REG;-PerfexionTM. Measurements were taken at various locations in a treatment room to validate the results of a Monte Carlo simulation system. The study shows that Monte Carlo simulations can be used in structural shielding design calculations for the Leksell Gamma Knife.
The aim of this study is to improve the characterization and modeling of the radiation field surrounding the Leksell Gamma Knife & REG;-PerfexionTM. The improved characterization of the radiation field enables more accurate shielding calculations to be performed for the areas adjacent to the treatment room. With the aid of a high-purity germanium detector and a satellite dose rate meter, 7-ray spectra and ambient dose equivalent H*(10) data were acquired at various locations in the field of a Leksell Gamma Knife unit in a treatment room at Karolinska University Hospital, Sweden. These measurements were used to validate the results of the PEGASOS Monte Carlo simulation system with a PENELOPE kernel. The levels of the radiation that passes through the shielding of the machine (leakage radiation) are shown to be much lower than what is suggested by various bodies, e.g. the National Council on Radiation Protection and Measurements, to be used when calculating radiation shielding barriers. The results clearly indicate that Monte Carlo simulations may be used in structural shielding design calculations for 7 rays from the Leksell Gamma Knife.

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