Re: Instrument efficiencies

["Philip Egidi" <phil.egidi@state.co.us>]

I suggest you check the recently-revised ANSI N323B-2003, American

National Standard for Radiation Protection Instrumentation Test and

Calibration, Portable Survey Instrumentation for Near Background

Operation.  It addresses your topic.  Additionally, ISO 7503, NUREG

1507, and MARSSIM all use the concept of instrument efficiency as well

as source efficiency, which are germane to your questions. 

Phil Egidi

Colorado



>>> "McEleney, Darin J LRB Contractor"

<Darin.J.McEleney@LRB01.USACE.ARMY.MIL> 01/03/05 01:26PM >>>

I am trying to find out if anyone can direct me to any reference

document

that specifies whether or not to use an efficiency (eff) established

from an

off-site calibration facility or an eff established on-site when the

newly

calibrated instrument/detector setup is received from off-site

facility.



Both on-site and off-site efficiency response tests for the site I am

currently on use NIST traceable Tc-99 sources for beta surface

activity,

however, the two efficiencies vary widely up to 10% difference.  



My experience over the past 16 years on over 2 dozen projects for

characterization and FSS with 5 different employers used an on-site

established efficiency over the calibration facility efficiency for a

more

representative efficiency on a particular site.  The site I work on

currently

wants to use the calibration facility's efficiency instead.  There are

numerous reasons why I don't want to use the calibration facility

efficiency

that I don't want to get into in this email due to the extent of the

discussion.



Does anyone have a reference for me?



Please respond to darin.j.mceleney@usace.army.mil 



Thank you,

Darin McEleney

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