[ RadSafe ] Dose basis for 5Ci/y discharge ?

[Keith Welch]

Hi Radsafers,

Does anyone out there know if there are models or studies that were used 
as the basis for the total sanitary sewerage discharge limits in 
10CFR20?  I know the specifics of potential dose would be as varied as 
there are possible emission sources or receptors.  But I haven't been 
able to find anything justifying the 5 Ci tritium limit (other than, it 
just seems to be a conservative number that is unlikely to affect public 
dose much).

Thanks for any advice.
Keith Welch
Jefferson Lab