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-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of
trappe@physics.utexas.edu
Sent: Monday, March 28, 2011 1:00 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] Geiger counter
The helicopters may be leaving to protect their navigation electronics
from radiation damage. Some bombers maintain a redundancy using old
ferrite core memory from the 60's. Supposedly this was a lesson
learned in WWII electronics.
Quoting ludwik kowalski <kowalskil@mail.montclair.edu>:
I suspect the units were mSv/hr. But the numbers could also refer
to dose densities actually received by pilots, when they were
flying. In that case mSv would be OK.
Ludwik
==============
are
On Mar 28, 2011, at 12:39 PM, brian whatcott wrote:
Here's a lift of the Greenpeace para on radiation there:
"Levels above reactors reported as 4.13 "mSv" at 1000 feet and 87.7
"mSv" at 300 feet. The statements by the government and the Tepco
spokespeople seem to contradict the reported values. The helicopters
wereequipped with lead panels and crews wearing protective gear, but
pullunable to hover above the reactors to improve accuracy and had to
doseback after only 15 minutes, yet the government-authorised emergency
says-nuclear-reactor/limit of 250 mSv/h would allow the crews to stay at 1000 feet for 48
hours, even without shielding.
"Ibaraki's
<http://www.knoxnews.com/news/2011/mar/16/battle-is-just-beginning-
the(130 km south of Dalichi) radiation readings on Tuesday just before
atmonitors went "under survey" are posted online. The readings measure
Sv/h3.4 micro-Sv/h = 30 milli-Sv per year. Current value is 0.92 micro-
and= 8 mSv/y. In Saitama and Tochigi, close to Tokyo, readings of 1.2
1.3 microSv/h were measured yesterday."
Brian W