[ RadSafe ] Gas Proportional Dectector - Mass Correction Sets

[Bradshaw, Keith]

 I'd say no, he does not want to do this.  The curve is a different shape
for activity homogeneously distributed within an absorber, versus a source
with an external absorber.

Having said that, I also think Chris should be looking to make his own
standards, using the exact same planchets, and ideally matching the matrix
he proposes to analyse.

That's if he's doing what I think he's doing !

Personal views only


keith.bradshaw at niras.co.uk

web:  www.niras.co.uk

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of Wesley
Sent: 07 February 2007 13:30
To: cwbecker at umich.edu; 'RADSAFE'
Subject: RE: [ RadSafe ] Gas Proportional Dectector - Mass Correction Sets

Christopher and Radsafe,

I am replying to all of Radsafe because I suspect others can learn from my
question (and your answer), not just me.

I am confused as to just what you are correcting for with planchets
containing Tc-99, each of different mass. Could you do the same with a
single Tc-99 source and a set of absorbers to place on top of the source?
Also, I would imagine the material (metal, plastic, etc.) and its density
would be critical to your purpose.

I wish you could describe the process and goal a bit for us.

Thanks.
Best regards, Wes
Wesley R. Van Pelt, PhD, CIH, CHP
Wesley R. Van Pelt Associates, Inc.
 

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf
Of Christopher W. Becker
Sent: Tuesday, February 06, 2007 7:31 PM
To: 'RADSAFE'
Subject: [ RadSafe ] Gas Proportional Dectector - Mass Correction Sets

All,

This is for those in the United States.  I am looking for a set of Tc-99
planchets to establish the mass correction curve for a gas flow proportional
counter.  Each should have an activity of approximately the same (say 500
Bq) with linearly increasing mass.

Thanks in advance.
Respectfully,
Christopher W. Becker


_______________________________________________
You are currently subscribed to the RadSafe mailing list

Before posting a message to RadSafe be sure to have read and understood the
RadSafe rules. These can be found at:
http://radlab.nl/radsafe/radsaferules.html

For information on how to subscribe or unsubscribe and other settings visit:
http://radlab.nl/radsafe/

**********************************************************************
AMEC Nuclear Holdings Limited (No. 3725076), AMEC NNC Limited (No. 1120437) and National Nuclear Corporation Limited (No. 2290928). The companies are all registered in England and Wales. The registered office of each company is at Booths Park, Chelford Road, Knutsford, Cheshire WA16 8QZ.  AMEC NNC's main switchboard number is 01565 633800.  
The AMEC NNC website is www.amecnnc.com

Any request, advice, information or opinion in this message which does not relate to the business of any of the above companies is not authorised by any of the above companies.  Where this message does so relate,  it is sent by the relevant company (as above) and is commercial in confidence and intended for the use of the individual or entity to whom it is addressed.  The content is subject to contract and, unless so stated, does not form part of any contract.  If you have received this e-mail in error please notify the AMEC NNC system manager by email at eadm at amecnnc.com.
**********************************************************************