Re: Nb-97m -Reply

[LIPTONW@detroitedison.com]

A good criterion to use in deciding whether to treat radionuclides in a single 
decay chain separately is found in 49 CFR 173.433(c):  "...a single 
radioactive decay chain in which the radionuclides are present in their 
naturally-occurring proportions, and in which no daughter nuclide has a half 
life either longer than 10 days or longer than that of the parent nuclide, 
will be considered as a single radionuclide...Otherwise, the parent and 
daughter nuclides will be considered as a mixture of different nuclides." 
 
Bill Lipton 
The opinions expressed are strictly mine. 
Here's to a risk free world, and other fantasies.

---

• To: Multiple,recipients,of,list,radsafe@romulus.ehs.uiuc.edu
• Subject: Nb-97m -Reply
• From: "radsafe@romulus.ehs.uiuc.edu" <radsafe@romulus.ehs.uiuc.edu>
• Date: 05 Nov 96 07:30:01
• Reply-to: radsafe@romulus.ehs.uiuc.edu

In principle, the Nb-97m radiation should be included in the Zr-97 dose values.  The
(almost) 1
minute half life of Nb-97m keeps it from being a cause for concern as an independent internal
emitter.  To make sure that Nb-97m has been included with Zr-97, ask Kieth Eckerman at
ORNL; he is the authority.

Charlie Willis

---