[ RadSafe ] Survey MDAs vs. Scan MDAs

Tue May 9 08:15:34 CDT 2006

A copy of NUREG-1507 can be found at:

http://www.orau.gov/ddsc/instrument/NUREG-1507.pdf

I hope it helps.

John

John S. McLamb, CHP, RRPT 
Health Physicist 
NIEHS, MD F0-07 
P.O. Box 12233 
Research Triangle Park, NC  27709 
Phone: (919) 541-4235 
Fax:  (919) 541-1893 

-----Original Message-----
From: Ron Reif [mailto:rreif at whoi.edu] 
Sent: Monday, May 08, 2006 1:21 PM
To: radsafe at radlab.nl
Cc: 'John Andrews'; 'steven pike'; 'Mary McGeoghegan'
Subject: [ RadSafe ] Survey MDAs vs. Scan MDAs

Dear Radsafe list:

I'm trying to determine the Minimum Detectable Activity (MDA) for gross
alpha measurements using a GM detector coupled to a rate meter.  Some
colleagues have pointed me to NUREG-1757, which I have reviewed.
NUREG-1757
refers to NUREG-1507, "Minimum Detectable Concentrations with Typical
Radiation Survey Instruments for Various Contaminants and Field
Conditions",
June 1998.  However, I cannot locate this document on NRC's web site.
Apparently, they do not keep 'older' documents on their web site.  Does
anyone have the proper MDA equations for evaluating (a priori) the
sensitivity of a rate meter?  It is my understanding that the standard
MDA
equation for integrated measurements (scaler mode) does not apply to
rate
meters.  A link to NUREG-1507 would also be appreciated.  

Please reply directly to me.  Thank you.

-----

Ron Reif, P.E.,CHP,CIH

EH&S Manager

Woods Hole Oceanographic Institution

http://ehs.whoi.edu

p:508-289-3788

f:508-457-2015

_______________________________________________
You are currently subscribed to the RadSafe mailing list

Before posting a message to RadSafe be sure to have read and understood
the RadSafe rules. These can be found at:
http://radlab.nl/radsafe/radsaferules.html

For information on how to subscribe or unsubscribe and other settings
visit: http://radlab.nl/radsafe/