Archived posting to the Leica Users Group, 2015/10/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hello, John: As the former Director of Publications for Kodak, I am well aware of radiation. The P3200 T-Max film could not be stored for long at all unless it was in a salt mine. That is where Kodak stored master rolls until ready for packaging and shipping. ...Ken On 1 October 2015 at 22:19, John Nebel <john.nebel at csdco.com> wrote: > In 20 years, cosmic rays may have slightly fogged the ASA 400 film, be > interesting to see. Worth a go anyway. > > "Ambient Background Radiation (Effects on Raw Stock > Ambient gamma radiation is composed of two sources: a low energy component > which arises from the decay of radionuclides and a high energy component > which is the product of the interaction of cosmic rays with the earth's > upper atmosphere. The radionuclides responsible for the low-energy photons > exist in soil and rock and are carried into earth derived building > materials such as concrete. Lead shielding or storage deep underground may > be helpful, but for long-term raw stock storage, radiation will still be a > factor. Upon exposure to ambient-background radiation, photographic > materials can exhibit an increase in minimum density, a loss in contrast > and speed in the toe, and an increase in granularity. > > The change in film performance is determined by several factors, such as > the film speed and length of time exposed to the radiation before the film > is processed. A film with an Exposure Index (El) of 500 can exhibit about > three times the change in performance as a film with an El of 125. While > this effect on a film product isn't immediate, we still suggest exposing > and processing the film soon after purchase. We recommend a period of no > more than six months from the time of film purchase before exposure and > processing, provided it has been kept under specified conditions. Films > kept for extended periods beyond six months may be affected, especially the > faster films, even if they have been frozen. The only way to determine the > specific effect of ambient-background radiation is to make actual tests or > measurements by placing a detector in the location where the film is > stored. The most obvious clue is the observance of increased granularity, > especially in the light areas of the scene." > > < > http://motion.kodak.com/motion/Support/Technical_Information/Storage/storage_info.htm#radiation#ixzz3nNB04BHX > > > > > > > On 10/1/15 6:07 PM, Richard Man wrote: > >> Ken, I will take them.Please send paypal/address info. >> >> Thanks >> >> On Thu, Oct 1, 2015 at 10:13 AM, Kenneth Lassiter <kenlass904 at >> gmail.com> >> wrote: >> >> As part of my downsizing, I must remove my stash of film from the freezer. >>> Thi sfilm was fresh when it was put into the freezer 20 years ago. It >>> should be perfect when warmed to room temperature. It has been stored in >>> the plastic cans inside freezer bags inside a large plastic container and >>> always in the freezer. >>> >>> Price REDUCED:US$60 for the lot of 115 rolls including shipping in the >>> USA. >>> >>> OR US$0.75/roll plus shipping. >>> >>> *# Rolls* >>> >>> *Film* >>> >>> *135-36 exp* >>> >>> *135-24 exp* >>> >>> 25 >>> >>> Ektachrome 200 Daylight >>> >>> X >>> >>> >>> >>> 26 >>> >>> Ektachrome 100 VS >>> >>> X >>> >>> >>> >>> 15 >>> >>> Fuji 100 Daylight slide film >>> >>> X >>> >>> >>> >>> 7 >>> >>> Fuji 400 Provia >>> >>> X >>> >>> >>> >>> 4 >>> >>> Ilford Delta B/W >>> >>> >>> >>> X >>> >>> 7 >>> >>> Kodak Supra 100 Color Neg >>> >>> X >>> >>> >>> >>> 5 >>> >>> T-max 400 >>> >>> X >>> >>> >>> >>> 8 >>> >>> Fuji Sensia 200 slidefilm >>> >>> >>> >>> X >>> >>> 5 >>> >>> Kodak Porta 400 NC >>> >>> X >>> >>> >>> >>> 4 >>> >>> Kodacolor Gold 200 Color Neg >>> >>> >>> >>> X >>> >>> 1 >>> >>> Kodak IR Ektachrome Prof >>> >>> X >>> >>> >>> >>> 3 >>> >>> Kodak Max 400 color neg >>> >>> >>> >>> X >>> >>> 10 >>> >>> Misc mixed single rolls >>> >>> X >>> >>> X >>> >>> *115* >>> >>> *Total rolls* >>> >>> >>> >>> >>> >>> Ken Lassiter >>> kenlass904 at gmail.com OR 561-247-7725 >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >>> >>> >> >> >> > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >