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

Author(s)

Cano, Nilo F. ^[1] ; Rao, T. K. Gundu ^[2] ; Ayala Arenas, Jorge S. ^[2] ; Javier-Ccallata, Henry S. ^[3] ; Watanabe, S. ^[4]

Affiliation

^[1] Univ Fed Sao Paulo, Inst Mar, Rua Doutor Carvalho Mendonca 144, BR-11070100 Santos, SP - Brazil

^[2] Univ Nacl San Agustin Arequipa UNSA, Escuela Profes Fis, Fac Ciencias Nat & Formales, Av Independencia S-N, Arequipa - Peru

^[3] Univ Tecnol Peru UTP, Fac Ciencias & Ingn, Av Tacna & Arica 160, Arequipa - Peru

^[4] Univ Sao Paulo, Inst Fis, Rua Matao, Travessa R 187, BR-05508090 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Radiation Physics and Chemistry; v. 180, MAR 2021.
• Web of Science Citations: 0

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 0 center presented a supra-linear dose response in the range of 50 to 5 kGy. (AU)

• FAPESP's process: 14/03085-0 - Quaternary geochronology of Southeastern and Southern coast of Brazil
• Grantee: Shigueo Watanabe
• Support Opportunities: Research Projects - Thematic Grants