Re:

[Brian_Gaulke@HC-SC.GC.CA]

No, this is not a de facto limit of 0.25 mSv.  You are confusing limits on

sources with limits on individual doses.



Brian R. Gaulke, CHP

brian_gaulke@hc-sc.gc.ca











"John Morgan" <rpconserv@HOTMAIL.COM> on 2002/02/15 12:25:33



Please respond to "John Morgan" <rpconserv@HOTMAIL.COM>



To:   radsafe@list.vanderbilt.edu

cc:    (bcc: Brian Gaulke/HC-SC/GC/CA)



Subject:









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?







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John Morgan

rpconserv@hotmail.com





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