[ RadSafe ] Fe-55 on LSC

Arvic Harms Arvic.Harms at npl.co.uk
Mon Mar 3 04:45:22 CST 2008

Dear all,

The National Physical Laboratory (NPL) supplies Fe-55 standards (and many others!) in case you are interested.

Kind regards,

Arvic Harms

Dr Arvic Harms
Radioactivity and Neutrons Group
National Physical Laboratory
Hampton Road
United Kingdom 
TW11 0LW
Tel: +44 208 943 8512
E-mail: arvic.harms at npl.co.uk

> -----Original Message-----
> From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl]On
> Behalf Of Michael Bohan
> Sent: 29 February 2008 18:53
> To: radsafe at radlab.nl
> Subject: Re: [ RadSafe ] Fe-55 on LSC
> Hello RadSafers,
> I used to leak test an Fe-55 source that was used to QA an x-ray 
> microscope.  The NRC, in the licensing process, insisted that 
> I had to 
> demonstrate my LSC efficiency for the wipe tests, so I also had to 
> purchase a liquid Fe-55 standard ampoule from what was then Isotope 
> Products Lab, which is now Eckert & Ziegler Isotope Products.  From 
> that I made a LSC standard with a contained activity of 0.211 uCi.
> Using the standard tritium LSC window, I was able to get an 
> efficiency 
> of around 14 - 20%, over the years I performed the tests.  
> However, if 
> you are going to do this and you need to demonstrate the results to 
> regulators, you will have to manufacture your own standard or 
> have some 
> one make it for you.  You'll need to make sure they use the same type 
> of vial and scintillant that you plan to use.  The energy is so low 
> that quenching and other factors can easily affect your efficiency.
> Regards,
> Mike Bohan, RSO
> Yale-New Haven Hospital
> Radiological Physics
> 20 York St. - WWW 204
> New Haven, CT 06510
> Tele: (203) 688-2950
> Fax: (203) 688-8682
> Email: mike.bohan at yale.edu
> This message originates from Yale New Haven Health System. The 
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