[ RadSafe ] RadSafe Digest, Vol 581, Issue 1

Harry Reynolds hreynolds at energysolutions.com
Mon Mar 28 09:01:39 CDT 2011

The Nuc Navy's 450 uuCi/100 sq cm converts to ~1,000 dpm/100 sq cm or
100 cpm/100 cm sq assuming a conservative 10% efficiency for a frisker
probe which is the same number used by most other folks for unknown
beta-gamma emitters.

Harry Reynolds

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Hout, Jason D.
Sent: Monday, March 28, 2011 12:45 AM
To: 'radsafe at health.phys.iit.edu'
Subject: Re: [ RadSafe ] RadSafe Digest, Vol 581, Issue 1

""Four hundred and fifty micro micro Curies per one hundred centimeters
squared" described the presumptive surface contamination limit when
measured with an RM-3 radiac and using a DT-304 pancake probe.  The 100
cm^2 is the formalized estimate of the area covered by an eight inch
long and 'S' curved swipe sample with approved media.  Were the
Fukushima NPP workers so drilled they might not be having some of the
issues we're hearing."

I sure hope you are talking about the large variance of reported
contamination and radiation values we are hearing out here (which are
more than likely caused by the media's interpretation vice the
technicians reporting the wrong value).  If you are referring to the
accident and release of contamination I would conclude that no level of
training could have prevented this.

I also am betting that they are not using a frisker and just multiplying
their count rate by 5 (or 4.5 depending on how "accurate" you want to
be) to assess the issue.  

Jason Hout
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