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Re: dose limits for members of the public
What we learn in the ICRP is that the exposure restrictions to all regulated
practices are termed dose limits, while the exposure restrictions to sources
are termed dose constraints. In relation to dose constraints, rhe ICRP
continues to recommend that the maximum value of the dose constraint to be
used in the optmization of radiological protection for a single source
should be be less than 1 mSv in a year, and that a value of no more than
about 0.3 in a year would be appropriate. ICRP 82 express: "Consideration
should be given to exposure situations where combinations of transitory and
prolonged exposures or a build-up over time of prolonged exposures from a
source could occur. In these situations it should be verified that
appropriate dose assessment methods are used for ensuring compliance with
the established dose constraint. The assessment should take into account of
any reasonably conceivable combination and build-up of exposures. If, in a
particular situation, such verification of compliance is not feasible, it
will be prudent to restrict the prolonged component of individual dose from
the source with a dose constraint of the order of 0.1 mSv in any given year
during the operational lifetime of the source.
In relation to dose limits the ICRP continues to recommend that the sum of
the prolonged and transitory exposures from all the regulated practices
should be restricted to a dose of 1 mSv in a year.
Key words to understand differences between limit and constraint:
restriction to regulated practices and restrictions to sources
Jose Julio Rozental
joseroze@netvision.net.il
Israel
----- Original Message -----
From: Bjorn Cedervall <bcradsafers@HOTMAIL.COM>
To: <radsafe@list.vanderbilt.edu>
Sent: Tuesday, February 12, 2002 3:57 AM
Subject: Re: dose limits for members of the public
For Sweden it is presently 0.1 mSv/yr (10 mrem/yr) - for a critical group
outside any one activity (like that of a nuclear power plant) - and 1 mSv/yr
for the total from all activities.
It may be of general interest to the Radsafers group to know (unless I
mentioned it earlier) that we now are heading for 0.01 mSv/yr - the decision
was taken three months ago. I spoke with two "inside" political party
members (two different parties) and asked about the reasons - explaining
that you get 0.2 mSv/yr from your own body and things like that.
I basically got the following:
1. It is politically correct
2. No one (among the politicians) understands the scientific issue
3. The parties have their fixed standpoints and the party members should
hence follow their party
My personal opinion about this is not politically correct,
Bjorn Cedervall bcradsafers@hotmail.com
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