EPR response of anhydrite crystal (CaSO4) for dosimetry of gamma photon beams

Nilo F. Cano; T. K. Gundu Rao; Jorge Sabino Ayala Arenas; Henry S. Javier-Ccallata; S. Watanabe

doi:10.1016/j.radphyschem.2020.109231

EPR response of anhydrite crystal (CaSO₄) for dosimetry of gamma photon beams

Nilo F. Cano, T. K. Gundu Rao, Jorge Sabino Ayala Arenas, Henry S. Javier-Ccallata, S. Watanabe

Departamento Académico de Física

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

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.

Original language	English
Article number	109231
Journal	Radiation Physics and Chemistry
Volume	180
DOIs	https://doi.org/10.1016/j.radphyschem.2020.109231
State	Published - Mar 2021

Bibliographical note

Funding Information:
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 ? irradiation of the samples. This work was carried out with partial financial support from FAPESP (Funda??o de Amparo ? Pesquisa do Estado de S?o 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).

Funding Information:
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).

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

Anhydrite (CaSO)
EPR
Radiation dosimetry

Access to Document

10.1016/j.radphyschem.2020.109231

Cite this

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title = "EPR response of anhydrite crystal (CaSO4) for dosimetry of gamma photon beams",

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.",

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AU - Cano, Nilo F.

AU - Gundu Rao, T. K.

AU - Ayala Arenas, Jorge Sabino

AU - Javier-Ccallata, Henry S.

AU - Watanabe, S.

PY - 2021/3

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AB - 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.

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