1st to 2nd February, 2012

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Here is the one week chart showing the day to day variation as measured with the Aware electronics fan filter attached and running. The peak on the 1st February coincided with rainfall. Very interesting since the ground is still covered with snow and frozen so how likely is it that Radon from the ground was the cause? Since I didn't stop the fan at the peak time I didn't record a decay curve. Judging by the 60 min average chart on the 1st, the half life is under 2 hours I would guess.

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