Four different MOFs were exposed to γ rays by a
cobalt-60
source reaching a maximum dose of 5 MGy. The results showed that the
MIL-100 (Cr) and MIL-100 (Fe) did not exhibit obvious structural damage,
suggesting their excellent radiation stability. MIL-101 (Cr) showed
good radiation stability up to 4 MGy, but its structure started degrading
with increasing radiation dose. Furthermore, the results showed that
the structure of AlFu MOFs started to decompose at a gamma dose of
1 MGy, exhibiting a much lower tolerance to γ radiation. At
this radiation energy, the dominant interaction of the gamma-ray with
MOFs is the Compton effect and the radiation stability of MOFs can
be improved by prolific aromatic linkers, high linker connectivity,
and good crystallinity. The results of this study indicate that MIL-100
and MIL-101 MOFs have a good potential to be employed in nuclear applications,
where relatively high radiation doses play a role, for example, nuclear
waste treatment and radionuclides production.
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