Specific Absorbed Fractions of Electrons and Photons for Rad-HUMAN Phantom Using Monte Carlo Method

TL;DR

This study calculates specific absorbed fractions (SAFs) for electrons and photons using the Rad-HUMAN phantom, a Chinese female voxel model, to improve internal dose estimation accuracy for Chinese populations via Monte Carlo simulations.

Contribution

The paper introduces a Chinese female-specific voxel phantom, Rad-HUMAN, and computes SAFs for electrons and photons, enhancing dose estimation accuracy for this demographic.

Findings

SAFs from Rad-HUMAN are similar in trend but larger than other models.

Differences attributed to racial and anatomical variations.

Provides reliable data for internal radiation dose calculations for Chinese women.

Abstract

The specific absorbed fractions (SAF) for self- and cross-irradiation are effective tools for the internal dose estimation of inhalation and ingestion intakes of radionuclides. A set of SAFs of photon and electron were calculated using the Rad-HUMAN phantom, a computational voxel phantom of Chinese adult female and created using the color photographic image of the Chinese Visible Human (CVH) data set. The model can represent most of Chinese adult female anatomical characteristics and can be taken as an individual phantom to investigate the difference of internal dose with Caucasians. In this study, the emission of mono-energetic photons and electrons of 10keV to 4MeV energy were calculated using the Monte Carlo particle transport calculation code MCNP. Results were compared with the values from ICRP reference and ORNL models. The results showed that SAF from Rad-HUMAN have the similar trends but larger than those from the other two models. The differences were due to the racial and anatomical differences in organ mass and inter-organ distance. The SAFs based on the Rad-HUMAN phantom provide an accurate and reliable data for internal radiation dose calculations for Chinese female.