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Thread: Radioactive Takumar ?!?!?

  1. #21
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    Default Re: Radioactive Takumar ?!?!?

    Quote Originally Posted by Ben Loke View Post
    Here the results after scanning with Radiation Alert Inspector device.

    1) SMC Takumar 55mm/1.8 = 55ÁSV/hr
    2) SMC A50mm/1.4 = 0.3ÁSV/hr
    3) TAIR 135mm/2.8 = 0.2ÁSV/hr

    All readings taken at rear element.
    After putting on the rear cap, the reading for SMC Takumar 55mm/1.8 = 11ÁSV/hr.
    That's much lower than 55ÁSV/hr as measured w/o the cap.
    Once the lens mounted on the cam, will measure soon.
    Last edited by Ben Loke; 28th December 2009 at 11:37 PM.

  2. #22
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    Default Re: Radioactive Takumar ?!?!?

    Quote Originally Posted by 9V-Orion Images View Post
    And I do not believed you will be exposing yourself with direct contact to the rear lens element for hours at a time.
    Okay... I'll have to stop looking at the rear element and saying to myself "So nice... "

    Orlyandico, I'm thinking that radiation from takumar lenses should be within the safety limit as long as we don't exceed 360 hours of use per year. That's pretty reasonable for an amateur like me. No worries. Pity the professional who uses Taks exclusively. OUCH !!!

    BIG THANK YOU to Ben for providing the readings.
    Last edited by sebianos; 28th December 2009 at 07:31 PM.
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  3. #23
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    Default Re: Radioactive Takumar ?!?!?

    Quote Originally Posted by sebianos View Post
    Okay... I'll have to stop looking at the rear element and saying to myself "So nice... "

    Orlyandico, I'm thinking that radiation from takumar lenses should be within the safety limit as long as we don't exceed 360 hours of use per year. That's pretty reasonable for an amateur like me. No worries. Pity the professional who uses Taks exclusively. OUCH !!!

    BIG THANK YOU to Ben for providing the readings.
    You're welcome.

    I done the last 2 readings when SMC Tak 55mm/1.8 mounted on cam.
    1) From camera back = 0.5ÁSV/hr
    2) From behind shutter plane = 1.0ÁSV/hr

    So, I guess better not to inspect the lens from the rear too often.

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