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Kodak Tmax P3200 film has to be used and processed quickly because it becomes fogged by background radiation, even if nowhere near an airport or a synchrotron. I think, but I'm not sure, that x-ray films and films for autoradiography and chemiluminescence also eventually become fogged by ambient radiation, regardless of where they are stored. Also, the recently discontinued Kodak Polymax Fine Art print paper gradually became fogged by chemical changes having nothing to do with radiation. Unless the film turned black, I would not attribute fogging of old x-ray film to the synchrotron. my 64 bits, Dan On Tue, 17 Jan 2006, William Scott wrote: > *** For details on how to be removed from this list visit the *** > *** CCP4 home page http://www.ccp4.ac.uk *** > > > > I wouldn't risk it. Get someone else to collect your data. I've found > old film in synchrotrons gets fogged from background radiation. Even if > everyone tells you it is safe, if something does go wrong, you will spend > the rest of your life worrying and wondering if that was why. > > > > On Tue, 17 Jan 2006, Maria Turkenburg wrote: > > > *** For details on how to be removed from this list visit the *** > > *** CCP4 home page http://www.ccp4.ac.uk *** > > > > > > OnLineHelpForm wrote: > > > > >Dear all, > > >I have some slightly off topic questions regarding pregnancy and > > >synchrotron work. I have carefully searched the web on this matter and > > >found nothing substantial so now I hope to get some help from the able > > >scientists of the ccp4bb! > > > > > >First, what about radiation? According to various sources, the radiation > > >limit for a pregnant woman should not be more than 50 mrem per month or > > >500 mrem during the entire gestation period. The radiation limit for an > > >adult is 5000 mrem per year. What kind of radiation levels can be expected > > >during synchrotron work? > > > > > >Second, what about magnetic fields? According to a study I found magnetic > > >fields of 0.4 microT had some correlation with increased incidence of > > >miscarriages. How does this level compare to magnetic fields found at > > >synchrotrons? > > > > > >Any information would be most welcome! > > > > > >Best regards > > >M > > > > > >Please send replies to the bulletin board. > > > > > Call me naive, emotional, whatever, but I'm surprised you're even > > considering visiting a synchrotron while pregnant. Is it really worth it? > > I don't have many lines of inquiry for you, but have you tried a search at > > http://www.hpa.org.uk/radiation/ > > > > Good luck, and I hope everything turns out OK for you. > > > > Maria Turkenburg > > >
