[ RadSafe ] Analog Eberline monitor background responses

[MEHRAN.A.MOHAMMADIAN at Sargentlundy.com]

Hello, RadSafers!  Long time listener / watcher but never poster here 
looking for some help.  I'm working on a project where there is an 
identified need to quantify the external ambient gamma background response 
of some analog Eberline particulate, iodine, and noble gas radiation 
monitors (early 1980s vintage).  I can't seem to find any documentation 
listing the background response for the specific models installed in the 
field in units of cpm / mR/hr (or similar). 

Does anyone have information that can be shared with me regarding the 
background response of any of the following configurations:

Particulate Monitor:
Vendor: Eberline
Detector: RDA-3A (Beta Scintillator)
Sample Chamber: SA-1 (Moving Filter Paper)
Interface Box: IB-2 (Operating in Gross Counting Mode)
Analog Display Module: EC2-7 (Capable of Fixed or Variable Background 
Subtract)

Noble Gas Monitor:
Vendor: Eberline
Detector: RDA-3A (Beta Scintillator)
Sample Chamber: SA-3
Interface Box: IB-2 (Operating in Gross Counting Mode)
Analog Display Module: EC2-7 (Capable of Fixed or Variable Background 
Subtract)

Iodine Monitor:
Vendor: Eberline
Detector: RDA-2A (Gamma Scintillator)
Sample Chamber: SA-2 (Fixed Cartridge)
Interface Box: IB-2 (2 SCA Cards, Automatic Gain Stabilized Mode)
Analog Display Module: EC2-7 (Capable of Fixed or Variable Background 
Subtract)

I sincerely apologize if I sent this message before.  The previous attempt 
didn't appear to go through nor does it show up on the RadSafe Archives 
for February 2018.

Thank you in advance!

--
Mehran Mohammadian, P.E.
Senior Associate (Licensed in IL)
Nuclear Power Technologies
Sargent & Lundy
office: 1-608-291-0447 | mobile: 1-920-312-0470
email: mmohammadian at sargentlundy.com