Special section on "Asian Conference on X-ray Absorption Spectroscopy 2019"

An evaluation of the dose conversion factor from graphite to water is essential to measure the absorbed dose to water using a graphite calorimeter. However, it is difficult to obtain the conversion factors from measurements. In the present study, Monte Carlo (MC) studies were performed to evaluate t...

Full description

Saved in:
Bibliographic Details
Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2020-06, Vol.171, p.1
Main Authors: Kim, YH, Yi, CY, Kim, IJ, Kim, BC, Kim, JH, Seong, YM, Kim, HM
Format: Article
Language:English
Subjects:
Bulk density
Computer simulation
Conversion
Evaluation
Graphite
Medical research
Sensitivity
Stopping power
X ray absorption
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An evaluation of the dose conversion factor from graphite to water is essential to measure the absorbed dose to water using a graphite calorimeter. However, it is difficult to obtain the conversion factors from measurements. In the present study, Monte Carlo (MC) studies were performed to evaluate the absorbed dose conversion factor from graphite to water. Based on the Electron Gamma Shower MC codes from National Research Council Canada, the modeling of the medical linear accelerator gantry at the Korea Research Institute of Standards and Science (KRISS) was optimized to obtain phase space files for evaluation of the absorbed dose conversion factor from graphite to water. The evaluated dose conversion factors for the KRISS graphite calorimeter were in the range of 1.040–1.085 for beams of 6–25 MV. A linear correlation between the dose conversion factors and tissue phantom ratio in water at depths of 20 cm and 10 cm (TPR20,10) of each X-ray beam was observed. To understand sensitivity of the obtained dose conversion factors, case studies were performed under different conditions in the simulation, such as different electron stopping power, assumed graphite bulk density, and different MC code. The uncertainties of the dose conversion factors will be finalized considering the results of sensitivity studies in the present study and additional studies in the future.
ISSN:0969-806X
1879-0895
DOI:10.1016/j.radphyschem.2020.108760