Re: temporal? variations in background

[Ted de Castro <tdc@XRAYTED.COM>]

actually no!  wrt gamma background and rain - SOMETIMES you can see a

"washout" from the atmosphere for the first 1/2 hour when the rain

starts - but in general the more it rains the lower the background -

when it stops going down - the ground is saturated.  This also clearly

shows in the annual variation - highest JUST before the fall rains and

lowest just after the spring storms.



I have years of environmental data taken with a very sensitive GM tube

(1 x 12 inch active area) that shows this.  Sensitivity 650k counts per

mREM - so it certainly has the sensitivity to show this.





Kai Kaletsch wrote:

> 

> While the discussion on variation in BG is going on: Does anyone have an

> idea of the variations in BG radiation over time? There are short term

> spikes in radon after a rain and there are changes in cosmic ray fluxes etc.

> How do these phenomena affect the long term average exposure?

> 

> For example, if my radiation exposure last year was 3.0 mSv and I live in

> the same place and do the same things this year, how close to 3.0 mSv can I

> expect my exposure to be this year?

> 

> How do these temporal variations in natural BG compare with events such as

> atmospheric weapons testing, Chernobyl etc...?

> 

> Thanks,

> Kai

> http://www.eic.nu

> 

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