the function of -70 for X-ray film

[Mad Dan Eccles]

In article <199510281917.OAA13346 at visar.wustl.edu>, nikolaic at VISAR.WUSTL.EDU (Nikolai Chitaev) writes:
>> 
>> I have a question to ask.   What is the real function of exposure
>> the p32 X-ray film in -70 c?
>> 
>> lili
> 
> I guess that at -70oC your ENHANCEMENT SCREENs will reflect emmited 
> b-particles toward the film, so providing more energy otherwise being 

No.  The screen actually phosphoresces (or fluoresces); the b-particle hits 
the screen, a photon(s) of light then comes back and darkens the film.

Richard
-- 
Richard P. Grant MA DPhil      rpgrant at molbiol.ox.ac.uk
Nuffield Department of Obstetrics and Gynaecology, University of Oxford.
http://sable.ox.ac.uk/~lady0266
"Winds light to variable"