[ RadSafe ] outdoor low dose rate measurements

[Robert J. Gunter, CHP]

Another good way is to do timed measurements at various scan points.  Many
of our clients use a 2X2 NaI with a scaler/ratemeter like a 2221.  The
output would be counts over some time interval.  The great thing about the
2221 is the preset count times and digital scale.

Yours,

Rob

Robert J. Gunter, MSc, CHP
CHP Consultants/CHP Dosimetry
www.chpconsultants.com
www.chpdosimetry.com
Toll Free: (888) 766-4833
Fax:  (866) 491-9913 
Cel:  (865) 387-0028
rjgunter at chpconsultants.com


-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of
JOHN.RICH at sargentlundy.com
Sent: Wednesday, April 03, 2013 3:39 PM
To: radsafe at health.phys.iit.edu
Subject: [ RadSafe ] outdoor low dose rate measurements

Radsafers

I just finished a calculation that's going to require a minimally trained
individual (not a radworker)  to notice the difference between 0.03 mrad/hr
and 0.13 mrad/hr on a handheld meter while walking around an outdoor storage
area. I'm stressing that this is a calculated result because it's the
maximum calculated difference. The minimum calculated difference is between
0.02 mrad/hr to 0.04 mrad/hr. Actual dose rates should fall somewhere in
between.

Is this a reasonable expectation, or is it asking too much of an outdoor
walk-around with a hand held meter?  BTW, I have no idea what the radon
conditions are.

thx in advance  - -jmr

John Rich
312-269-3768
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