RE: IPM7/8 response checks.

["Lavera, Ron" <Ron.Lavera@nypa.gov>]

Mr. Revels

I wouldn't consider Cl-36 to be representative of the beta from power
reactor corrosion products.  With an e-max of about 710 keV for Cl-36
compared to e-max of 511 keV ( principle beta ) for Cs-137 and e-max 319
keV for Co-60, the two principle corrosion products at our plant, the
efficiency from Cl-36 would be non conservative for our application.
Tc-99 has a beta energy very close to Co-60 and a long half life, so we
consider that a bit easier to use than  Co-60.  

In any event, you should match your efficiency source to the beta energy
of the principle isotopes of your source term.

Ron LaVera
lavera.r@nypa.gov

-----Original Message-----
From: James.P.Revels@ucm.com [mailto:James.P.Revels@ucm.com]
Sent: Friday, October 23, 1998 12:10 PM
To: Multiple recipients of list
Subject: RE: IPM7/8 response checks.


Well, trends really should not be a factor in determining what nuclide
is
used for calibration or source check. It should be 
based on your plant mix. We use a nuclide which best represents our
average
beta energy.Co-60 is used for calibration and 
Tc-99 for source check.

> -----Original Message-----
> From:	Dieter Geduld [SMTP:Dieter.Geduld@eskom.co.za]
> Sent:	Friday, October 23, 1998 9:50 AM
> To:	Multiple recipients of list
> Subject:	IPM7/8 response checks.
> 
> 
> If anyone could assist me on this one. Does anyone use the IPM8 (NE)
> personnel monitors at the exits of there controlled zones in nuclear
> power plants. If so,  what sort of source response check is performed
> on them? Is it Co-60, Cs-137 or Cl-36? or some other nuclide (Eu-152?
> , Tc-99?).
> Currently we are using Cl-36 to source response check ours. 
> What are the current trends at stations in the US? 
> 
> Please email me privately.
> Thanks in anticipation.
> Dieter
> 
> email: Dieter.Geduld@eskom.co.za
>
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