EPR response of anhydrite crystal (CaSO4) for dosimetry of gamma photon beams. (March 2021)

• Record Type: Journal Article
• Authors: Cano, Nilo F.; Gundu Rao, T.K.; Ayala Arenas, Jorge S.; Javier-Ccallata, Henry S.; Watanabe, S.
• Is Part Of: Radiation physics and chemistry. Volume 180(2021)
• Publication Date: 2021-03
• Subjects: Anhydrite (CaSO4) -- Radiation dosimetry -- EPR; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2020.109231
• Languages: English
• ISSNs: 0969-806X

Abstract

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. Highlights: The EPR spectrum of the anhydrite crystal exhibits signals due to O − ion, (SO3 ) - and (SO4 ) - radicals. Some dosimetric properties of EPR signals of the anhydrite crystal were studied. Anhydrite crystal may be used to measure gamma dose that varies from 1 Gy up to 5 kGy.