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Heavy Element Photophysics and Photochemistry
TcF5:
Preparation, Properties, and Separation from UF5
We have developed a new means of producing technetium pentafluoride (TcF5)
and characterized some of the physical properties of the produced material.
During our work, we discovered a novel means of separating TcF5
and UF5. Mixtures of TcF5and UF5 (and
other uranium fluorides and oxyfluorides) exist within U.S. uranium isotope
separation plants. The presence of as much as 80 kg of Tc-99 per plant
is the result of use of impure UF6 feedstock. Mixtures of TcF5
and UF5may also be generated if refluorination is used during
the decontamination and decommissioning (D&D) of cascade stages in
such plants. Separation of TcF5and UF5has the potential
to reduce the hazard category of D&D-generated waste because the presence
of significant amounts of Tc-99 in uranium-bearing waste prevents near-surface
disposal of the waste.
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