In contrast to studies in other hospital departments, no methicillin-resistant Staphylococcus aureus was identified on computer mice in the emergency department. These results suggest that mouse operated software is not adding to infection control problems in relation to methicillin-resistant Staphylococcus aureus in this environment.
A series of characterization and dissolution studies has been performed to define flowsheet conditions for the dissolution of uranium oxide materials in HB-Line Phase I dissolvers. The samples selected for analysis were uranium oxide materials originally from Rocky Flats and recently shipped to the Savannah River Site. The selection of these uranium oxide materials for characterization and dissolution studies was based on high enriched uranium content and trace levels of plutonium. Test results from the characterization study identified ferric oxide (Fe 2 O 3) and iron/chromium/nickel (Fe/Cr/Ni) particles as impurities along with the tri-uranium oxide (U 3 O 8) and uranium trioxide (UO 3). The weight percent uranium in this material was found to vary depending on the impurity content. The trace impurity plutonium appears to be associated with the Fe/Cr/Ni particles. A small amount of absorbed moisture and waters of hydration is present. Most of the uranium oxides easily dissolved in low-molar nitric acid solutions without fluoride within one to two hours at solution temperatures between 60-80 O C. A small amount of residue remained following this dissolution step. To assure complete dissolution of uranium from these oxide materials, an additional dissolution step at 90 O C to boiling for at least one to two hours has been suggested. Only trace amounts of iron associated with Fe 2 O 3 and Fe/Cr/Ni particles will dissolve during the dissolution steps. Neither hydrogen nor heat will be generated during the dissolution of these uranium oxide materials in nitric acid solutions. Some brown nitrogen dioxide (NO 2) fumes will be generated during the dissolution of U 3 O 8 .
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