Re: External Dose Constants

["GARY MANSFIELD" <GARY.MANSFIELD@quickmail.llnl.gov>]

        Reply to:   RE>External Dose Constants for Beta Emitters

Quick reply to Vincent Finelli.

Your "someone" has been reading too many comic books.  Since the range of
tritium betas in air is less than 1 cm, I kind of doubt that the dose
equivalent rate at 1 foot from an H-3 source is going to be much greater than
zero.   (All bets are off if you've got bremsstrahlung production, which you
CAN get in some bizarre sets of circumstances, but . . . that's another
story.)

--------------------------------------
Date: 5/25/95 9:20 AM
To: GARY MANSFIELD
From: radsafe@romulus.ehs.uiuc.edu
     Radsafenetters, I am not a HP although I subscribe to this 
     list.  Many years ago I have studied Radiochemistry, 
     attended radiation safety courses and used radioisotopes 
     (low levels) in my research activities, but I do not recall 
     to have ever known the existance of tables reporting 
     Specific Dose Constants for beta emitters.  There are 
     tables for Specific Gamma Ray Dose Constants in units of 
     (mSv/h)MBq at 1 meter from a point source, but I have not 
     found similar tables for beta emitters, not even for hard 
     beta radiation.  Could any radsafenetter out there help me 
     to estimate the external dose-equivalent rate from an 
     unshielded point sources at a distance of 1 meter or 1 foot 
     (or whatever unit) for the following nuclides:  H-3, C-14, 
     P-32, P-33, S-35?  Thanks for your help.
     P.S. Someone told me that the dose-equivalent rate for H-3 
     at 1 foot from the point source is 1 (mrem/h)mCi.  Is this 
     an acceptable value?
     Vincent N. Finelli, Dir.
     Environmental Heath & Safety
     Florida Atlantic University
     Boca Raton, FL 33431
     E-mail: VFinelli@acc.fau.edu
     

     
     

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Subject: External Dose Constants for Beta Emitters
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