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- W4313491372 abstract "A sample of PuO2 powder undergoes self radiolysis, causing water present in the solid to generate hydrogen, oxygen, and minor species (e.g. H2O2). This is a matter of concern for stored PuO2, since the gases could react exothermically and rupture the container. In experiments at LANL, most PuO2/salt samples generate mostly H2, but a few samples generate a mixture of H2 and O2 together. In these special cases, the mixture of H2 and O2 in the pore volumes of the powder will then be subject to radiolysis, causing the reverse reaction H2 + O2 $Rightarrow$ H2O. In order to understand the steady-state quantities of these gases, it is necessary to estimate the amount of energy from the alpha irradiation that drives this reaction. This report outlines one possible approach for this process, yielding a value for the fractional amount of radiation deposited in the gas phase of 294 ppm. This corresponds to the case of a powder with porosity of 78%. We then use a comprehensive chemical kinetics model based on elementary gas phase reactions to calculate the rate of conversion back to water. We estimate a reduction in the H2 pressure of about 12 kPa/month, which applies only when O2 is simultaneously present in the gas phase." @default.
- W4313491372 created "2023-01-06" @default.
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- W4313491372 date "2023-01-03" @default.
- W4313491372 modified "2023-10-14" @default.
- W4313491372 title "Gas-phase Radiolysis in Plutonium Dioxide Powder" @default.
- W4313491372 doi "https://doi.org/10.2172/1907476" @default.
- W4313491372 hasPublicationYear "2023" @default.
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