Re: I-125 Effluent Monitori

["ROB FORREST" <ROB_FORREST.RSO#u#MAILROOM@rsomacserver.rso.upenn.edu>]

                      RE>>I-125 Effluent Monitoring                10/6/94
You could try using the Hazard Index calculation from NUREG 1400 "Air Sampling
in the Workplace" to determine if the quantity, form, process, etc.  of the
radionuclide requires air sampling to be performed.  Be careful, however,
because I would imagine you also have to comply with the EPA's NESHAPS
requirements.  That changes the requirements from basically a 50 mrem CEDE to 3
mrem CEDE for iodine.  In addition, even if you do charcoal sampling for iodine
for NESHAPS I believe you need to use a GE counting system for I-125 sampling. 
The EPA also uses different release fractions than the NRC for iodine.  In
essence, good luck no matter what method you choose.

Rob Forrest
(I'd hate to buck the trend of disclaimers, so I disclaim the above)

--------------------------------------
Date: 10/6/94 3:11 PM
To: ROB FORREST
From: radsafe@romulus.ehs.uiuc.edu
Received: by rsomacserver.rso.upenn.edu with SMTP;6 Oct 1994 15:11:05 U
Received: from romulus.ehs.uiuc.edu by vixen.cso.uiuc.edu with SMTP id AA16143
  (5.67b/IDA-1.5 for <rob_forrest@rsomacserver.rso.upenn.edu>); Thu, 6 Oct 1994
14:07:33 -0500
Received: by romulus.ehs.uiuc.edu (NX5.67d/NeXT-2.0)
	id AA13819; Thu, 6 Oct 94 14:07:12 -0500
Date: Thu, 6 Oct 94 14:07:12 -0500
Message-Id: <009858A2.78969360.144@msu.oscs.montana.edu>
Errors-To: mandel@romulus.ehs.uiuc.edu
Reply-To: radsafe@romulus.ehs.uiuc.edu
Originator: radsafe@romulus.ehs.uiuc.edu
Sender: radsafe@romulus.ehs.uiuc.edu
Precedence: bulk
From: Erick Lindstrom <avrel@trex.oscs.montana.edu>
To: Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Subject: Re: I-125 Effluent Monitoring
X-Listserver-Version: 6.0 -- UNIX ListServer by Anastasios Kotsikonas
X-Comment:  Radiation Safety Distribution List 

Does anyone out there presently demonstrate compliance with the 10CFR20 
3E-10 uCi/ml I-125 air effluent concentration limit without using (1) 
air sampling or (2) charcoal filtration? If so how?

There was a CRSO paper given by John Eichling of the Washington University
School of Medicine in 1983 that had data on the volatized fraction of I-125
during typical iodination procedures.  These data were revised in 1986.

Does anyone have any "new" data in this regard?  The Eichling data did not
suggest that they were employing the use of "gas-capture" activated charcoal
syringes.  By what factor do these syringes attenuate the fraction of 
volatile I-125 released in the hood? 

-Erick

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