[ RadSafe ] WESTON FOOT CANDLE METER, MODEL 614

[ROY HERREN]

It's just a guess, but it's possible that the photo cell may contain selenium.  If the cell contains selenium then it most probable contains some selenium-79, see 

http://www.deq.state.id.us/inl_oversight/contamination/fact_sheets/selenium.pdf
Selenium-79 decays by emitting a beta particle with a half-life of 65,000 years with no attendant gamma radiation.
 How Is It Used? 
and exposure meters for photography and as a toner for photographic and copier uses. 
 Selenium has a number of industrial applications. It is used in photocells, solar cells,
Roy Herren 




________________________________
From: "Kovach, Michelle A" <Michelle.Kovach at icp.doe.gov>
To: radsafe at health.phys.iit.edu
Sent: Wed, June 16, 2010 10:37:54 AM
Subject: [ RadSafe ] WESTON FOOT CANDLE METER, MODEL 614

Does anyone know what source is contained within the Weston Foot Candle
Meter, Model 614?  It appears to have been manufactured between
1934-1957 from Weston Instruments, Inc. in New Jersey (USA).  If you do
have any information, could you please forward it to me?  Thank you in
advance for any help you may be able to provide.
Thank you, 
Michelle A. Kovach 
Accelerated Retrieval Project (ARP) Radiological Engineering 
(208) 533-0156: Office/(208) 351-2916: Cellular 
  
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