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  1. #1
    djkloss's Avatar
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    ambient radiation???

    what is that? I tried goggling the term but couldn't find anything that I could understand in plain English. I read in a few different forums it can fog film.

    Thanks

  2. #2
    frdrx's Avatar
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    Radiation present in the surrounding environment.

  3. #3
    PeterB's Avatar
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    Better known as Background Radiation.

    There are 3 sources. The earth, the upper atmosphere and outer space. the latter two are impractical to protect against. Such high energy photons (gamma radiation) and particles(cosmic rays) pass through any practical shielding you choose to place around your film. Over time the radiation will reduce the contrast of your film and paper.

    Kodak has is a bit more info here and here.

    Quote Originally Posted by djkloss View Post
    what is that? I tried goggling the term but couldn't find anything that I could understand in plain English. I read in a few different forums it can fog film.

    Thanks

  4. #4
    Dan Henderson's Avatar
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    Over time the radiation will reduce the contrast of your film and paper.

    So I can blame ambient radiation for the reduction in contrast of my thinking as well? I knew I should have started wearing an aluminum foil hat years ago!


    web site: Dan Henderson, Photographer.com

    blog: https://danhendersonphotographer.wordpress.com/

    I am not anti-digital. I am pro-film.

  5. #5
    djkloss's Avatar
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    Quote Originally Posted by FirePhoto View Post

    So I can blame ambient radiation for the reduction in contrast of my thinking as well?
    Sounds good to me!

  6. #6

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    Quote Originally Posted by FirePhoto View Post
    ....So I can blame ambient radiation for the reduction in contrast of my thinking as well? I knew I should have started wearing an aluminum foil hat years ago!
    It wouldn't do any good, some particles, neutrinos, are believed to be able to travel through lead with a thickness measured in light years.
    "Pictures are not incidental frills to a text; they are essences of our distinctive way of knowing." Stephen J. Gould

  7. #7

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    ambient radiation (according to the physics i've been taught) is usually 3-4 counts per second, on a standard geiger tube/counter.

  8. #8
    Photo Engineer's Avatar
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    Quote Originally Posted by FirePhoto View Post
    Over time the radiation will reduce the contrast of your film and paper.

    So I can blame ambient radiation for the reduction in contrast of my thinking as well? I knew I should have started wearing an aluminum foil hat years ago!
    Ummm, for this you would need a lead helmet.

    PE

  9. #9
    Vaughn's Avatar
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    Quote Originally Posted by Photo Engineer View Post
    Ummm, for this you would need a lead helmet.

    PE
    And a footballer's neck muscles!

    Vaughn
    At least with LF landscape, a bad day of photography can still be a good day of exercise.

  10. #10
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    Quote Originally Posted by panastasia View Post
    It wouldn't do any good, some particles, neutrinos, are believed to be able to travel through lead with a thickness measured in light years.
    They will in fact collide on rare occasions. The Icecube Observatory at the South Pole is looking for the Cherenkov (spelling?) radiation produced when a neutrino strikes a water molecule.

    http://icecube.wisc.edu/
    Don't sweat the petty things and don't pet the sweaty things! http://rwyoung.wordpress.com

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