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RE: Liquid Scintillation



I'm not at all sure what use these  standards are that you get with these

instruments.  The engineer uses them to do the commissioning checks when the

instrument is installed, and you can use them as check sources to do regular

instrument performance checks.  BUT if you use them as efficiency standards,

you could have some big errors.  



The best thing is to buy some certified reference solutions and make your

own efficiency standards.



Personal views only



keith.bradshaw@niras.co.uk



NIRAS

NNC Ltd

601 Faraday St

Birchwood Park

WARRINGTON

WA3 6GN

UK





http://www.niras.co.uk



-----Original Message-----

From: Russ Johnson [mailto:rujohnso@nmsu.edu]

Sent: 05 October 2004 21:13

To: radsafe@list.Vanderbilt.Edu

Subject: Liquid Scintillation





Hello;

Our office will be procuring a liquid scintillation counter in the very

near future. I am looking for a source to buy some liquid standards.

Most companies I've seen when browsing the web only advertise H-3 and

C-14 standards for their units. But, we also will need counting

capability for several other isotopes, both beta and alpha emitters.

Does anyone have a US-based commercial source for standards other than

H-3 and C-14? I'm new at scintillation counting, so any advice is

appreciated. Please reply to my email address. Thanks.

-Russ Johnson, Rad Safety Specialist

  EH&S office

  New Mexico State University





NNC's UK Operating Companies : NNC Holdings Limited (no. 3725076), NNC Limited (no. 1120437), National Nuclear Corporation Limited (no. 2290928), STATS-NNC Limited (no. 4339062) and Technica-NNC Limited (no. 235856).  The registered office of each company is at Booths Hall, Chelford Road, Knutsford, Cheshire WA16 8QZ except for Technica-NNC Limited whose registered office is at 6 Union Row, Aberdeen AB10 1DQ.  NNC's head office and principal address is Booths Hall and the switchboard number is 01565 633800.  The NNC website is www.nnc.co.uk



Any information or opinions in this message which do not relate to our business are not authorised by any of the above companies.  Where this message does relate to our business the content is sent to you by the relevant company (as above) and is confidential and intended for the use of the individual or entity to whom it is addressed.  The contents do not form part of any contract unless so stated.  If you have received this e-mail in error please notify the NNC system manager by email at eadm@nnc.co.uk.



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