Hello,
the HTM 01-05 says:
"Intra-oral radiology film and
devices used in digital
radiology imaging are potential sources of crossinfection.
Accordingly, where reusable devices are
used, they should be decontaminated in accordance
with the manufacturer’s instructions. For intra-oral
holders, this will require the use of steam
sterilization following washing and disinfection."
I am not sure that alcohol wipes is correct to use but best check with manufacturer.