[ RadSafe ] reference source re-calibration

[John G. Hunt]

I would like to thank the help received. The site 
http://www.npl.co.uk/irmf/publications.html has much good information, and 
from the *.pdf "The Examination, Testing and Calibration of Portable 
Radiation Protection Instruments GPG 14" chapter 6 there comes the 
recommendation that:

"Tertiary standards include similar devices and sources, which have been 
compared, not with the primary standard, but with an appropriate secondary 
standard. Tertiary standards should be calibrated against a secondary 
standard at least every four years and be the subject of at least an 
intercomparison check every two years. As tertiary standards are generally 
more frequently used at a working level, they are more vulnerable to loss of 
calibration and therefore require more regular calibration against the 
secondary standard. 

This was what I wanted. The NPL also has a "Radionuclide Calibrator users 
forum" at http://www.npl.co.uk/rcuf/, which is open to this kind of 
discussions.


John Hunt.
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