[ RadSafe ] Ambient Dose Rates in Fukushima Prefecture

[Neil Keeney]

Hi:

This is the conventional distance for taking post-plume passage field
measurements. Corresponds to the approximate center of mass; about waist
level.  The Aerial Monitoring System (AMS)  normalizes flyover field
readings to this height as well...

Regards,

Neil Keeney


On Thu, Nov 21, 2013 at 1:51 AM, <henric.bolander at vattenfall.com> wrote:

> I guess its 1 m above the ground?
>
> /Henric
>
>
>
> -----Ursprungligt meddelande-----
> Från: radsafe-bounces at health.phys.iit.edu [mailto:
> radsafe-bounces at health.phys.iit.edu] För Ted de Castro
> Skickat: den 20 november 2013 05:44
> Till: The International Radiation Protection (Health Physics) Mailing List
> Ämne: Re: [ RadSafe ] Ambient Dose Rates in Fukushima Prefecture
>
> At 1 meter from what????
>
> On 11/19/2013 8:33 PM, Joel C. wrote:
> > It was pointed out to me that ambient levels in the Fukushima Prefecture
> have been steady at about 0.75 uSv/h @ 1 meter for many months, but
> recently fell to 0.28 uSv/h.  With patience, you can see the change at:
> >
> >
> > http://radioactivity.nsr.go.jp/en/list/192/list-1.html
> >
> > Anyone want to try to explain the decrease?  I guessed snow cover; but
> the data from 2012 winter are 0.6-0.7 uSv/h.
> >
> >
> > Joel I. Cehn, CHP
> > Radiation Info
> > joelc at alum.wpi.edu
> >
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