Re: Individual Dose Monitoring

[rkathren@tricity.wsu.edu (Ron L. Kathren)]

Sandy --

Given the well documented environmental (eg latent image instability)
problems with films used in the field for long intervals, I would be quite
reluctant to have a wearing or field exposure interval for film dosimeters
of longer than 1 month; for TLD, 6 months or even years may be fine.  Some
sites (eg Hanford) utilize a single TLD as a backup or as a long term
'lifetime' dosimeter for nonradiation workers.

Ron Kathren



At 01:43 PM 10/22/97 -0500, Sandy Perle wrote:
>> However, other regulations require maxium dosimetry periods of 1 
>> month for film and 3 months for TLDs.
>
>Some states currently allow film dosimetry to be worn for a quarter, 
>and, there is a move within the power reactor world towards 
>semi-annual as well as annual TLD processing. There are a few that 
>are currently processing semi-annually. For optimum results with the 
>least external factors affecting the dosimeter response, it is my 
>recommendation that film be processed monthly and a TLD not exceed a 
>quarterly processing. This is not to say that good dosimetry as well 
>as good results can't be obtained beyond these time periods. A result 
>is only as good as the program implemented, the algorithm and all 
>factors contained within it, and, most importantly, the Quality 
>Assurance Program implemented.
>
>------------------
>Sandy Perle
>Technical Director
>ICN Dosimetry Division
>Costa Mesa, CA 92626
>Office: (800) 548-5100 x2306 
>Fax:    (714) 668-3149
>  
>sandyfl@ix.netcom.com
>sperle@icnpharm.com
>
>ICN Dosimetry Website:
>http://www.dosimetry.com
>
>Personal Homepage:
>http://www.geocities.com/CapeCanaveral/1205
>
>"The object of opening the mind, as of opening 
>the mouth, is to close it again on something solid"
>              - G. K. Chesterton -
>
>