[ RadSafe ] Under-reporting at Fukushima?

Mark Ramsay mark.ramsay at ionactive.co.uk
Sat Jul 21 11:42:31 CDT 2012

If we are talking high energy gamma emitters like say Cs-137 - then you
would be looking at 22mm of lead to provide a 10th value thickness (i.e.
reduce to one tenth of incident value). 

I am not sure what type of dosimetry is being worn - if it were a
passive dosimeter (like a TLD) then wrapping in lead would show up since
you would need see the superficial HP 0.07 dose (as would be expected). 


-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Steven Dapra
Sent: 21 July 2012 17:18
To: radsafe at agni.phys.iit.edu
Subject: [ RadSafe ] Under-reporting at Fukushima?

July 21

	According to this Reuters article (link below),

"workers at the stricken Fukushima nuclear power plant were urged by a
subcontractor to place lead around radiation detection devices in order
to stay under a safety threshold for exposure."

	The workers, it says, were told "to cover the devices called
dosimeters when working in high-radiation areas."

	Assuming that a high radiation area is an area of gamma
radiation, how much lead (ounces or pounds) would be necessary to make a
barrier thick enough to make a significant difference in the amount of
gamma that would pass through it?  Could one carry around this much lead
on a lapel-mounted dosimeter?


Steven Dapra

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