Effects of temperature during the irradiation of calcium carbonate

Negrón‐Mendoza, A.; Camargo-Raya, Claudia; Gómez‐Vidales, Virginia; Uribe, R.M.; Ramos-Bernal, S.

doi:10.1016/j.apradiso.2016.02.004

Cited by 4 publications

(1 citation statement)

References 19 publications

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“…However, very little relevant information can be found about the radiolysis of calcite itself, − and none on biphasic systems of calcite and water. A series of studies by Albarrán et al have shown that the leaching of gamma- and self-irradiated Ca 14 CO 3 yielded significant amounts of formic, oxalic, glyoxylic, glycolic, and acetic acid. , However, G -values are determined for a single-dose irradiation.…”

Section: Introductionmentioning

confidence: 99%

Radiolytic Dissolution of Calcite under Gamma and Helium Ion Irradiation

et al. 2017

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Samples of calcite have been irradiated using both the 60.7 MeV helium ion beam of the ARRONAX (Nantes, France) cyclotron and 661.7 keV gamma radiations. The irradiation of calcite pellets results mainly in radiolytically generated gas (H2, CO2). The presence of superficial water during the calcite irradiation in a humid atmosphere is a key factor for the production of radiolysis gases. Besides, the irradiation of calcite–water biphasic media was performed. The gas released after these irradiations is quantified. No significant amount of CO2 has been detected, whereas carbonate ions act as OH• scavengers, thus inducing an increase of H2 production. The amount of hydrogen peroxide created confirms this scavenging mechanism. Finally, ionic chromatography experiments with irradiated solutions allow us to quantify the organic anions (formate HCOO–, acetate CH3COO–, propionate CH3-CH2COO–, and oxalate C2O4 2–) formed by calcite and/or carbonate ion radiolysis and study the variation of calcium carbonate solubility under irradiation. Formate and acetate ions are formed at low irradiation doses, whereas oxalate is favored at high irradiation doses. The increase of calcium ions in solution during the irradiation of calcite–water media indicates that calcite is progressively dissolved during the irradiation. The main difference between calcite–water media and carbonate ion solutions is that calcite acts as a carbonate ion supply in the radiolysis mechanisms.

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