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Re: Worse case vs. normal operations

When we plan the proteccion it is necessary to take into consideration the
dose constraint, which serves as a bound in the optimization. For
occupational exposures, is a value of individual dose limited the range of
options considered in the process of optimization. For public exposure, the
dose constraint is an upper bound on the annual doses that members of the
public should receive from the planned operation of any controlled source.
The dose constraint for each source is intended to ensure that the sum of
doses to the critical group from all controlled source remains within the
dose limit. Let's give an example: A nursey non  occupational worker in a
nuclear medicine facility (unsealed and sealed sources treatment), and
living in a area close to a nuclear power plant. She as Member of the public
can be submited a two diferent sources of radiation, and the sum of both
can't be higher than 1 mSv per year.



----- Original Message -----
From: <BLHamrick@aol.com>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Sent: Thursday, November 09, 2000 7:58 PM
Subject: Re: Worse case vs. normal operations


> Compliance with the two millirem in any one hour limit is without regard
to
> occupancy.  That is, at the boundary of the unrestricted area, the dose
may
> not exceed two millirem in any one hour (note:  this is not a dose-rate
> limitation).
>
> Compliance with the 100 millirem in any one year limit may include
> consideration of occupancy of the area.  The registrant may use reasonable
> assumptions to estimate occupancy, but must have some basis for those
> estimates, and ensure that when the occupancy changes in an area (due,
e.g.,
> to the addition of a new office next to the x-ray area, etc.) that these
> changes will initiate a new evaluation of the potential public dose in
that
> area.
>
> Barbara L. Hamrick
> BLHamrick@aol.com
>
> Although I work for the State of California, this is not an official
> interpretation of the regulations.  You may want to contact your local
> inspection agency.
>
> In a message dated Thu, 9 Nov 2000  4:25:50 PM Eastern Standard Time,
"Susan
> McElrath" <smcelrath@atl.mediaone.net> writes:
>
> << This is a multi-part message in MIME format.
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> This question concerns an industrial x-ray installation in the state of
> California.  When demonstrating compliance with requirements for doses to
> non-radiation workers, must you show worse-case conditions (an individual
> plants themselves next to the unit 24-hours a day and the unit operates
> 24-hours a day), or may you use normal conditions, e.g., an individual is
in
> the area several feet away from the unit for 8-10 hours per day and the
unit
> operates 6 hours a day?
>
> Susan McElrath
> smcelrath@atl.mediaone.net <mailto:smcelrath@mindspring.com>
>
>
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