Re: Worse case vs. normal operations

[BLHamrick@aol.com]

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:

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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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