[ RadSafe ] Natural tritium production (was: BNL tritium, etc.)

Clayton J Bradt CJB01 at health.state.ny.us
Thu Feb 2 13:23:36 CST 2012

According to Okada, S. and Momoshima,N (Health Phys. 65(6):595-609;1993),
the equilibrium inventory of naturally produced tritium (mostly cosmogenic)
is 1.0 - 1.3 EBq or 27 - 35 MCi. (31 MCi)/(9700 Ci/g) = 3.2 kg tritium. At
equilibrium (creation rate) = (decay rate), so (1.15 E18 Bq)*(365.25
d/y)*(86400 s/d)*(3 g/mol)/(6.022 E23 mol-1)= (181 g/y)*(9700 Ci/g) = 1.75
MCi/y.  Jerry Cohen's value for cosmogenic tritium production was 6 MCi/y,
so the value Dan gets for the annual mass of natural tritium produced seems
to be correct, given the assumptions used.

Clayton J. Bradt
Principal Radiophysicist
NYS Dept. of Health
Biggs Laboratory, Room D486A
Empire State Plaza
Albany, NY 12201-0509

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