[ RadSafe ] Reference source re-calibration

Dahlskog, Leif Leif.Dahlskog at health.wa.gov.au
Fri May 20 09:25:20 CEST 2005


The U.K's National Physical Laboratory has a number of useful guides in
the area of calibrations for download from

I don't recal whether any listed there have a recommnedation for
re-calibration period for the reference sources - I'll leave that for
you to check.


Leif Dahlskog 
Senior Health Physicist
Radiation Health Branch 
Department of Health, Western Australia 
Ph    (+61 8) 9346 2260 
Fax (+61 8) 9381 1423 
The contents of this e-mail transmission are intended solely for the
named recipient(s), may be confidential, and may be privileged or
otherwise protected from disclosure in the public interest.  The use,
reproduction, disclosure or distribution of the contents of this e-mail
transmission by any person other than the named recipient(s) is
prohibited.  If you are not a named recipient please notify the sender

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of John G. Hunt
Sent: Friday, 20 May 2005 2:40 PM
To: radsafe at radlab.nl
Subject: [ RadSafe ] Reference source re-calibration

Perhaps Radasfers could help with a question that I have not been able

The problem:
For the rectangular reference sources (tracable) for calibrating
hand-held surface contamination monitors - alpha emitters or beta-gamma
emitters; For sources with long lived radionuclides (Am-241 for
example); For sources that are well looked-after;

The question:
How often do these sources have to be re-calibrated or renewed?    
Is there an international or national or "good practice guide" that
refers to this problem, and to the (re-)calibration interval?

John Hunt.

More information about the radsafe mailing list