Re: Manufacturers of Standardized Calibration Sources (I-125)

["JERRY ROSEN" <ROSEN@rso.radsafe.pitt.edu>]

Date:          Tue, 30 Jan 96 11:54:12 -0600
Reply-to:      radsafe@romulus.ehs.uiuc.edu
From:          Erick Lindstrom <avrel@gemini.oscs.montana.edu>
To:            Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Subject:       Manufacturers of Standardized Calibration Sources (I-125)


Consider calibrating the sources yourself.  Check out NCRP-58.  The 
section on SUM-PEAK-COINCIDENCE COUNTING.  Equation 3.23 yields quite 
acceptable results when used with a NaI(Tl) or Ge detector.  In fact 
if you have an individual with a significant I-125 burden in their 
thyroid, the technique will give an adequate thyroid deposition 
estimate.  It is relatively independant of geometry and overlying 
absorber.


____________________
Radsafers:

I'm looking for a "less expensive" supplier of traceable I-125 calibration
sources (between 1 and 10 uCi).  Typically, I like to use the epoxy filled
"test tube" type of configuration (ideal for insertion into a neck phantom).
I've been purchasing from Isotope Products, but their prices have gone
through the roof.  I've considered using Amersham/Isotrak, however, the
sources they have available are in standardized solution configurations
(ampoule).

Can any of you point me in the direction of alternative manufacturers of
this type of source?

Thanks for your help!

-Erick Lindstrom

 Erick Lindstrom
 Radiation Safety Officer
 309 Montana Hall
 Montana State University
 Bozeman, MT  59717-0244
 Phone: (406) 994-2108
 Fax:	(406) 994-4792
 avrel@gemini.oscs.montana.edu

Jerry Rosen

University of Pittsburgh
Phone:  412-624-2728
Fax:    412-624-3562
Email:  Rosen@radsafe.pitt.edu