[ RadSafe ] Fe-55 on LSC

[Arvic Harms]

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
Teddington 
Middlesex
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 
> information contained in this message may be privileged and 
> confidential. If you are the intended recipient, you must 
> maintain this 
> message in a secure and confidential manner. If you are not the 
> intended recipient, please notify the sender immediately and destroy 
> this message. Thank you.
> 
> _______________________________________________
> 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/
> 

-------------------------------------------------------------------
This e-mail and any attachments may contain confidential and/or
privileged material; it is for the intended addressee(s) only.
If you are not a named addressee, you must not use, retain or
disclose such information.

NPL Management Ltd cannot guarantee that the e-mail or any
attachments are free from viruses.

NPL Management Ltd. Registered in England and Wales. No: 2937881
Registered Office: Serco House, 16 Bartley Wood Business Park,
                   Hook, Hampshire, United Kingdom  RG27 9UY
-------------------------------------------------------------------