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The permissible concentrations of radioisotopes in
sea water -- not in drinking water -- were calculated by
Carritt et al.in Publication 655 of the National Academy of
Sciences - National Research Council (1959).
The purpose
of making the calculations was to establish a limit for the
concentration of radioisotopes in sea water,
so that the
uptake of radioisotopes by fish living in the water would
be less than the MPC value for fish.
The permissible sea
water concentration (PSC) for any one radioisotope was
calculated by dividing the MPC value for fish by the factor
by which the fish concentrated the isotope from sea water.
The ratio of water intake to fish intake that was used in
the Carritt report was 10,
the same as above.
stated in the report in this form, PSC .
Although not
(MPC) f
concentration factor
where (MPC)f is the value for (MPC)w corrected for the
difference between water and fish intake and is obtained by
multiplying (MPC)w by the ratio of the calculated water
intake (2.2 kilograms) to the actual fish intake.
A partial
permissible concentration value for seafood for radioisotopes to be expected as waste from the operation of nuclear-
powered ships has been calculated by Revelle et al in
3