Monte Carlo simulation of photon specific absorbed fractions for internal self-dosimetry of the thyroid based on a Filipino model
Abstract
Specific absorbed fraction (SAF) is an important factor in self-dosimetry for internal organs. Differences between Filipino and Caucasian statistics may cause inaccurate dose estimation in internal dosimetry for Filipinos. In this study, the Oak Ridge National Laboratory (ORNL) adult phantom is rescaled using the height and weight of a Filipino reference man to become a model for Filipino males and females. Monte Carlo simulation using Monte Carlo N-Particle Transport code version 6.2 (MCNP6.2) is done to determine self-SAF values of the thyroid organ in each phantom. It was determined that the differences between the thyroid self-SAFs of a Filipino Male was higher than that of the ORNL adult phantom by 19.55% on average and that of the Filipino female was higher than that of the ORNL adult phantom by 21.61% on average. The scaling down of the thyroid phantom geometry resulted to an increase in self-SAF. The results show that the self-SAF computation using ORNL adult phantom is inaccurate for Filipinos and that rescaling the ORNL phantom or the use of a model suited for Filipino statistics is important before it can be used for accurate internal dosimetry.
Downloads
Published
Issue
Section
License
By submitting their manuscript to the Samahang Pisika ng Pilipinas (SPP) for consideration, the Authors warrant that their work is original, does not infringe on existing copyrights, and is not under active consideration for publication elsewhere.
Upon acceptance of their manuscript, the Authors further agree to grant SPP the non-exclusive, worldwide, and royalty-free rights to record, edit, copy, reproduce, publish, distribute, and use all or part of the manuscript for any purpose, in any media now existing or developed in the future, either individually or as part of a collection.
All other associated economic and moral rights as granted by the Intellectual Property Code of the Philippines are maintained by the Authors.
