External Dose Constants for Beta Emitters

[VFINELLI@ACC.FAU.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