RE:

[Jack_Earley@RL.GOV]

It's only a de facto limit if you don't want to use area TLDs to show that

your tour route produces less than 1 mSv per year. You don't care, nor

should you, what Joe Public does offsite.



Jack Earley

Radiological Engineer





-----Original Message-----

From: John Morgan [mailto:rpconserv@HOTMAIL.COM]

Sent: Friday, February 15, 2002 9:26 AM

To: radsafe@list.vanderbilt.edu

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?







..........................................

"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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