Title
EPR response of anhydrite crystal (CaSO4) for dosimetry of gamma photon beams
Date Issued
01 March 2021
Access level
metadata only access
Resource Type
journal article
Author(s)
Gundu Rao T.K.
Watanabe S.
Universidad Federal de Sao Paulo
Publisher(s)
Elsevier Ltd
Abstract
An anhydrite (CaSO4) natural sample was studied as possible dosimeter for low and high gamma doses using the technique of electron paramagnetic resonance (EPR). EPR spectrum showed signals due to (SO3)-, (SO4)- radicals and O- center. The anhydrite sample was irradiated with gamma rays with low-dose ranges typical for medical therapy (1–20 Gy) up to high-dose of about 70 kGy. The EPR centers due to (SO3)- and (SO4)- exhibited a linear dose response in the dose range from 1 Gy to 500 Gy, whilst the O- center presented a supra-linear dose response in the range of 50 to 5 kGy.
Volume
180
Language
English
OCDE Knowledge area
Química orgánica
Física de partículas, Campos de la Física
Subjects
Scopus EID
2-s2.0-85096931001
Source
Radiation Physics and Chemistry
ISSN of the container
0969806X
Sponsor(s)
The authors would like to express thanks to Ms. E. Somessari from the Institute for Energy and Nuclear Researches (IPEN), Brazil, for kindly carrying out the γ irradiation of the samples. This work was carried out with partial financial support from FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo), Brazil (Process number 2014/03085-0). This work was partially supported by CONCYTEC-FONDECYT, Peru, in the framework of the call E038-01 (Process number 037-2019).
Sources of information:
Directorio de Producción Científica
Scopus