Naturally-occurring Tritium

[Lester Slaback <Lester.Slaback@NIST.GOV>]

NCRP 62, pg 33, has a plot of tritium conc vs ocean depth, ranging from 18
TU to zero.  So any 'average' is rather artificial.  Pg 24 has a table of
concentrations vs latitude, again highly variable.  So I suspect that any
quoted average is of little use except to compute a world inventory.
note: 1 TU= 3.231 pCi/L(H2O)
Disclaimer:  the above are the personal musings of the author, and do not
represent any past, present, or future position of NIST, the U.S. government,
or anyone else who might think that they are in a position of authority. 
Lester Slaback, Jr.  [Lester.Slaback@NIST.GOV] 
NBSR Health Physics 
Center for Neutron Research 
NIST
100 Bureau Dr.  STOP 3543 
Gaithersburg, MD  20899-3543 
301 975-5810 voice
301 921-9847 fax
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