conversion number

[Lester Slaback <Lester.Slaback@NIST.GOV>]

There is no good response for this question.  Given the drastic energy 
dependence such a calibration factor is uncertain easily by a factor of 
three or more.  A point, collimated source of Co-60 versus a point, 
uncollimated source versus a radiation field from a distributed Co-60 
source will all be very different; not to speak of the response difference 
if the source is another energy.
On the other hand if the detector SYSTEM includes energy differential 
information with appropriate energy dependent conversion factors (as with 
many of the expensive portable NaI spectrometers that are now available) it 
is a different situation.  But I suspect this is a basic 'microR' instrument.

 >Does anyone have a typical conversion from cps to rem/hr for a Co-60
 >sensitive Nai detector?


Disclaimer:  the above are the personal musings of the author, and do not 
represent any past, present, or future position of NIST, the U.S. 
government, or anyone else who might think that they are in a position of 
authority.
Lester Slaback, Jr.  [Lester.Slaback@NIST.GOV]
NBSR Health Physics
Center for Neutron Research
NIST
100 Bureau Dr.  STOP 3543
Gaithersburg, MD  20899-3543
301 975-5810 voice
301 921-9847 fax

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