title: Effects of temperature during the irradiation of calcium carbonate.
abstract: Calcium carbonate received gamma irradiation at different doses (0-309kGy) and temperature regimes (77-298K) to study the effects of irradiation temperature. The changes were followed by EPR spectroscopy. We observed the formation of a composite EPR spectrum, even at low radiation doses and temperature. There was a strong effect on the evaluation of the radicals formed as a function of irradiation temperature, probably due to the diffusion in the frozen powder and the recombination of some radicals at room temperature.
authors.affiliation: Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México (UNAM), México D.F. 04510, México. Electronic address: negron@nucleares.unam.mx.
authors.forename: Alicia
authors.initials: A
authors.lastname: Negrón-Mendoza
authors.affiliation: Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México (UNAM), México D.F. 04510, México.
authors.forename: Claudia
authors.initials: C
authors.lastname: Camargo-Raya
authors.affiliation: Instituto de Química, Universidad Nacional Autónoma de México UNAM, México D.F., México.
authors.forename: Virginia
authors.initials: V
authors.lastname: Gómez-Vidales
authors.affiliation: Kent State University College of Applied Engineering, Sustainability and Technology, Kent, OH, USA.
authors.forename: Roberto M
authors.initials: RM
authors.lastname: Uribe
authors.affiliation: Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México (UNAM), México D.F. 04510, México.
authors.forename: Sergio
authors.initials: S
authors.lastname: Ramos-Bernal
keywords: Calcium carbonate; Free radicals; Gamma radiation; Low temperature