Cardboard Autorad cassettes

[GRGGTA at PATERSON.CHRISTIE-HOSPITAL.MANCHESTER.AC.UK]

Quite recently someone mentioned that cardboard cassettes (sold by Kodak)
are good for autorad exposures at -80 degrees C. We currently have a
cassette crisis in the lab and have little money-these cassettes cost out
at approx 3.50 sterling each. They would be ideal if screen/blot/film
contact is good. Could whoever mentioned their use reiterate how they
use them?
Graham Atherton - Thanks