Re[2]: Finger rings and P-32

["Cummings, Frederick" <CUMMINFM@inel.gov>]

     Reply to Mike Coogen and Bruce Busby re: accreditation of extremity
     dosimetry systems.  There is now, no requirement for the accreditation
     of extremity dosimetry systems, but as Bruce states, it is a matter of
     time.  Currently, the NIST and DOE are awaiting the distribution of
     the ANSI standard governing performance testing of extremity dosimetry
     systems.  It is expected that the standard could be published as early
     as September (I believe that it is finished and ready.)  The National
     Voluntary Laboratory Accreditation Program (NVLAP) and the DOELAP will
     implement accreditation programs this fall or next year (if the
     standard is published.)  The beta sources in the testing standard
     include 204-Tl, 90-Sr/90-Y and the uranium slab source.

     For further information you can contact Paul Martin (NVLAP) at the
     NIST (sorry, Paul for (mis?) representing you) or myself (DOELAP) for
     further info.

     Rick Cummings      (cumminfm@inel.gov)
     DOELAP Performance Evaluation Program Administrator

     Thoughts and opinions expressed above are my own, based on an aging
     memory among other things and don't necessarily reflect those of my
     employer.   *** that is, I can get in trouble quite enough on my own,
     thank you. ***


______________________________ Reply Separator _________________________________
Subject: Re: Finger rings and P-32
Author:  RADSAFE (INELMAIL.RADSAFE) at _EMS
Date:    8/16/95 8:46 AM


Bruce:  Your questions on the efficiency of the finger ring and the minimum
detectable dose can be answered by the organization that processes your TLDs.
As for as NAVLAP certification, that would depend upon what areas did the TLD
processer qualified.  There are several areas to NAVLAP certification.  I
believe that if you process TLD for extremity exposures, you must be certified
in that area.  I would get in touch with LES Slazback.  As for as PIs receiving
greater that 10 percent of limits using P-32, I would say that the potential is
there, but frequency is rare.  I have quite a few PI using P-32 and the doses
received by these individuals were insignificant over the 4 years that I
performed medical research..mike coogen sends


______________________________ Reply Separator _________________________________
Subject: Finger rings and P-32
Author:  radsafe@romulus.ehs.uiuc.edu at hq2ccgw
Date:    8/15/95 6:40 PM



Hi All,

I was just wondering, what is the efficiency of a (single element?)
finger ring for P-32 beta dosimetry?  What is the Min Dose measurable?

Also, the 10% limit for badging (10CFR20.1502) would be 5 rem/yr (skin and
extremities), 500 mrem/yr(whole body). Has anyone on radsafe had a PI or
worker get that much from using P-32 in a lab?

As a note, I noticed that processors are not required to have NAVLAP
certification for
extremity monitoring (10CFR 20.1501.c).

P-32 (roughly) has 1.7 MeV beta (E max), 0.69 MeV (E ave)

-Bruce Busby