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The Environmental Protection Agency (EPA) regulation
40 CFR Part 190 addresses individual radiation doses from all pathways
and all nuclear fuel cycle facilities combined, except exposure from radon
and its decay products is excluded. The regulation 10 CFR Part 20 states that
that all radiation exposure be kept "as low as reasonably achievable"
(ALARA). For ALARA evaluations, all releases, including radon and its
decay products,
are considered for calculation of population doses and individual
doses. Population doses are calculated for the region within 80-km of
the mill center and for the continental United States (from radon and
its decay products
only).
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