Formation of ammonium uranate on uranium dioxide during aging under controlled storage conditions

Innovative Vibrational Spectroscopy Research for Forensic Application

“…To characterize the formation of ammonium uranate on UO 2 during aging in storage, Said et al utilized both Raman and FTIR spectroscopy. 171 UO 2 samples were aged in the presence of ammonium sulfate from 6 to 24 months under constant relative humidity. It was determined that, when pure UO 2 was aged, it reacted to form a mixed phase assemblage with ammonium uranate being a common product.…”

“…However, Raman spectroscopy is the most useful technique for analyzing UOCs. To characterize the formation of ammonium uranate on UO 2 during aging in storage, Said et al utilized both Raman and FTIR spectroscopy . UO 2 samples were aged in the presence of ammonium sulfate from 6 to 24 months under constant relative humidity.…”

Investigation of Radiation Effects in the Uranyl Mineral Metaschoepite

“…The chemical processes that cause alteration of uranium oxides are important in nuclear forensics, nuclear waste storage and disposal, environmental chemistry, and mineralogy. − In the case of forensics, interdicted nuclear material may exhibit chemical and morphologic features related to its history, including storage conditions. − In nature, the alteration of the most abundant uranium oxide uraninite, UO 2+ x , produces hundreds of uranyl mineral species . Alteration of uranium oxides has also been observed for irradiated nuclear fuel and uranium ore concentrates (yellowcake). , …”

Ozone-Facilitated Formation of Uranyl Peroxide in Humid Conditions

“…Controlled storage studies of nuclear material are frequently employed for understanding their alteration behavior as a function of time and other regulated variables. , In particular, long-term waste studies reveal dynamic speciation under defined storage conditions. , Manipulation of the atmosphere, specifically relative humidity (RH), results in the formation of thin films of water that are stabilized on a solid surface. Complex adsorption and condensation regimes are governed by variables including the surface charge of the mineral, functionalization of the mineral surface, as well as hydrogen-bonding capacity .…”