Bob, if you want decent detection efficiency of that photo film, especially if the integration time is long (hours), it is best to cool the film because thermal effects will erase the latent image. Place the whole assembly in a refrigerator.
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Hi Renevega, good tip. Well - they have been strapped on most of the weekend and intention was to keep them there until they can be developed. I am not sure if it is a good idea to have them in the house/fridge if they are emitting high energy photons.