Re: Radiation Detector Calibrations

["Deborah P. Steva" <dps3c@kelvin.seas.virginia.edu>]

Chris:

What you are proposing to do is exactly what we do. We have
done this for many years, is written in our license and has
been acceptable.  We have very few labs that measure mR/hr.
Does not make sense to calibrate with Cs source.  We pulse the
instruments for cpm scale calibration and them use various
sources to obtain efficiency and ensure meter responds to
actual radiation.

D. Steva
University of Virginia

According to CCHOGAN@life.uams.edu:
> 
> I would be interested in any responses you get on this subject.  We have always
> calibrated our instruments in mR/hr with a Cs-137 source.  But no one here uses
> Cs-137 and most of our usage is P-32, S-35, P-33 or I-125.  For this reason, 
> we are considering calibration of the instrument's CPM scale using a pulser
> and then determining the detection efficiency of the individual probes for 
> the particular isotopes in use.  Does anyone out there have references
> (regulatory or otherwise) that would favor one method over the other?
> 
> Chris Hogan
> Health Physics Technologist
> University of Arkansas for Medical Sciences
> Occupational Health and Safety
> cchogan@life.uams.edu 
> or 
> chogan@colan.uams.edu
> 
> All opinions are my own...
> This has not been read or approved by my employer...
> This has not been read or approved by my employer..
> 
> From: Eric A. Goldman
> 
> I am trying to determine the "best" way to calibrate a survey instrument...
> 
>