Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 75,166   Posts: 1,658,513   Online: 784
      
Page 1 of 4 1234 LastLast
Results 1 to 10 of 38
  1. #1

    Join Date
    Mar 2011
    Shooter
    35mm
    Posts
    679

    Freezer film storage

    Suppose you were going to build a small, lead-shielded film storage box in your freezer in the shed. Anybody know how thick the lead would have to be to stop your typical cosmic ray? A couple mm's enough?

    s-a

  2. #2

    Join Date
    Mar 2008
    Location
    San Diego, CA, USA
    Shooter
    Multi Format
    Posts
    2,286
    Images
    21
    Nope. Cosmic rays are mostly high-energy protons, which can penetrate multiple centimeters of lead. (Various citations available through Google, largely scientific papers from the 1930s when there was a bit of a boom in cosmic-ray research, but most of them are pay-per-view for the details. The abstracts usually contain vague statements like "not much loss of energy".)

    -NT
    Nathan Tenny
    San Diego, CA, USA

    The lady of the house has to be a pretty swell sort of person to put up with the annoyance of a photographer.
    -The Little Technical Library, _Developing, Printing, And Enlarging_

  3. #3
    BradS's Avatar
    Join Date
    Sep 2004
    Location
    S.F. Bay Area, California
    Shooter
    Large Format
    Posts
    4,089
    Images
    1
    The bottom drawer of the fridge has always been completley satisfactory for my needs. Ther is certainly no need to freeze film.

  4. #4
    Brian C. Miller's Avatar
    Join Date
    Dec 2010
    Location
    Everett, WA
    Shooter
    Large Format
    Posts
    495
    Blog Entries
    2
    Images
    13
    The only way from keeping your film from being degraded by cosmic rays is to move it to a different dimension, where cosmic rays don't exist.

    I have used frozen film 30 years old, and it had no age degradation. It was stored locally in the Seattle area, in a normal freezer. I really suspect cosmic rays have little to do with film degradation, and more to do with local background radiation. I'm guessing that film storage in Nevada is a serious problem.

    What film are you trying to store?

  5. #5
    jp498's Avatar
    Join Date
    Oct 2009
    Location
    Owls Head ME
    Shooter
    Multi Format
    Posts
    1,467
    Images
    74
    3' of earth is equivalent to quite a bit of lead or steel for shield from cosmic rays. google and wikipedia it.... However, storing material underground could also expose it to radon or mineral radiation and potential flooding.

  6. #6
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    24,438
    Images
    65
    A salt mine is ideal!

    PE

  7. #7

    Join Date
    Mar 2011
    Shooter
    35mm
    Posts
    679
    Quote Originally Posted by Brian C. Miller View Post
    The only way from keeping your film from being degraded by cosmic rays is to move it to a different dimension, where cosmic rays don't exist.

    I have used frozen film 30 years old, and it had no age degradation. It was stored locally in the Seattle area, in a normal freezer. I really suspect cosmic rays have little to do with film degradation, and more to do with local background radiation. I'm guessing that film storage in Nevada is a serious problem.

    What film are you trying to store?
    OK everybody, I get the drift It's Tri-X, and it's going in the freezer because there's not enough room in the fridge. Point well taken, PE, but people didn't trust the WIP very much either, did they.

    s-a

  8. #8
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    24,438
    Images
    65
    Since there are about 30 acronyms using WIP, which one of them did you mean to refer to? I take "Weapon Impact Point" Kinda nice or perhaps "Women in Photography", as it is more on-topic.



    PE

  9. #9
    MattKing's Avatar
    Join Date
    Apr 2005
    Location
    Delta, British Columbia, Canada
    Shooter
    Multi Format
    Posts
    13,836
    Images
    63
    I wonder if a thick layer of Twinkies could stop cosmic rays.

    It could kill two birds with one stone .

    What do you think, PE?
    Matt

    “Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”

    Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2

  10. #10
    jbl
    jbl is offline
    jbl's Avatar
    Join Date
    Dec 2009
    Location
    California, USA
    Shooter
    35mm RF
    Posts
    94
    I second the salt mine idea. That's what I use :-).

Page 1 of 4 1234 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin