Dosimetric evaluation of methyl red radiochromic film for radiation processing
ISSN: 0369-9420
Article publication date: 29 September 2020
Issue publication date: 11 March 2021
Abstract
Purpose
The purpose of this paper is to present a radiochromic film dosimeter containing polyvinyl alcohol (PVA) matrix and various concentrations of methyl red (MR) dye for high dose measurements.
Design/methodology/approach
The MR-PVA films were exposed to irradiation up to 60 kGy using 60Co source of gamma ray. The ultraviolet and visible regions (UV/VIS) spectrophotometry were used to examine the optical density of pre-and post-irradiated dosimeters at 424 nm.
Findings
The dose sensitivity of MR-PVA films increases significantly with increasing MR dye concentrations in the dose range of 5 to 60 kGy. The impact of relative humidity, irradiation temperature, dose rate and the stability of the films has been analyzed. The overall uncertainty of the MR-PVA film dosimeter is 6.12% (Double Standard-deviation, 95% confidence level).
Practical implications
It was found that the MR-PVA films may be used as high dose dosimeter with an acceptable overall uncertainty in routine industrial radiation processing.
Originality/value
The color bleaching of irradiated MR-PVA films in terms of specific absorbance curves increases significantly with increasing absorbed dose up to 60 kGy.
Keywords
Acknowledgements
The authors would like to acknowledge the support of King Abdulaziz City for Science and Technology (KACST) in funding this project (grant 10-BIO960-20).
Citation
AL Zahrany, A., Rabaeh, K., Eyadeh, M. and Basfar, A. (2021), "Dosimetric evaluation of methyl red radiochromic film for radiation processing", Pigment & Resin Technology, Vol. 50 No. 2, pp. 157-162. https://doi.org/10.1108/PRT-02-2020-0008
Publisher
:Emerald Publishing Limited
Copyright © 2020, Emerald Publishing Limited