the function of -70 for X-ray film

[Sasha Kraev]

David, I felt like responding to the other, not entirely accurate 
statement, that was more about the screen rather than the emulsion.
This question belongs to a newsgroup alt.photo.hobby or something like,
however, I am not sure that it takes exactly two hits to make a 
development centre in a silver grain, as the mechanism of reciprocity 
failure is outside my profession. However, perhaps you know why the
films like Reflection can be ( according to NEN-DuPont's ad )
exposed at RT and still are as sensitive as their old counterparts, 
exposed at -70 C?
Regards,

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