Re: Thyroid dose limit

[Ccja@aol.com]

In the U.S., the regulatory limits for occupational exposure are set in
consideration of both stochastic and deterministic effects. The statutory
tables are written so that: "When an ALI (Annual Limit on Intake, my
parenthesis) is defined by the stochastic dose limit, this value alone is
given. When an ALI is determined by the non-stochastic dose limit to an
organ, the organ or tissue to which the limit applies is shown, and the ALI
for the stochastic limit is shown in parentheses." Thus, "The use of the
ALI's listed first, the more limiting of the stochastic and non-stochastic
ALI's will ensure that non-stochastic effects are avoided and that the risk
of stochastic effects is limited to an acceptably low value." Note that the
limits on effluent concentrations only take account of the risk of stochastic
effects, since deterministic effects are presumed not to occur, at the dose
levels that are permissible for members of the general public.

chris alston