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For design of new facilities we are guided by the recommendations in NCRP
116 for exposure to members of the public. It states the design protection
goal is such that "no member of the public would exceed the 1 mSv annual
effective dose limit from all man-made sources" (not including medical
care). However, the confusion comes on p47:
"whenever the potential exists for exposure of an individual member of the
public to exceed 25% of the annual effective dose limit as a result of
irradiation attributable to a single site, the site operator should ensure
that the annual exposure of the maximally exposed individual, from all
man-made exposures, does not exceed 1mSv on a continuous basis.
Alternatively, if such an assessment is not conducted, no single source or
set of sources under one control should result in an individual being
exposed to more than 0.25 mSv annually."
Isn't this a de facto limit of 0.25 mSv? How often are we going to be able
to garrantee that Joe Public isn't touring reactor sites as a prefered
vacation activity? So the real question is for RPPs and facility shielding,
should the goal be 0.25 mSv or 1 mSv effective dose for an individual?
..........................................
"People demand freedom of speech to make
up for the freedom of thought which they
avoid. "
- Soren Kierkegaard
..........................................
John Morgan
rpconserv@hotmail.com
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