Sunday, July 29, 2012

37X Background Radiation in 12:30pm STL Storms

The rain/storm from this morning ended at approximately 12:30pm. A swipe from our truck returned a reading 37x greater than background levels. A swipe taken 3 hours earlier returned  a reading of 27x greater than background radiation. Our live outdoor airborne radiation monitor recorded an approximately 50% increase in background radiation. (see below)

A quick look at chart indicates that weather moved into the area around 5am with an initial peak in radioactivity that may represent local washout. From 6am to 12pm airborne radioactivity increased as the leading edge of the jetstream neared Saint Louis.


  1. Looking at the jet stream maps, you were directly down wind of the leading termination edge of the jetstream.
    Basically, you are picking up fallout that blew in from somewhere else.

    We have tested such fallout for extended periods, this post gives a good example of the longer half life fallout found in the samples.

    We collect this data in our "lead cave" with two pancake geiger counters, you can see that lab here:

    If you want to understand what we think is going on see this video:

    I'll wager, if the Japanese keep reporting data, that in a few weeks we will (as has previously been the case) see the evidence show up as elevated Iodine 131 readings reported at Japanese sewage treatment plants.

  2. Sounds like Radon break down bi-products since none of the other radiation monitoring sites around you are having elevated readings. next time throw your sample in a ziplock or a canning jar to trap the water (in case it was tritium contamination.) and wait 8 days for follow up test (break down period for radon bi-products/naturally occurring isotopes.). If still high then you've got yourself a goodly sample of tritium and someone local is leaking like a sieve.

  3. Iodine-131 is still measured from dried sewage sludge in Chiba

    Sample 1
    Sample taken 7/20/2012
    217 km from Fukushima plant
    Iodine 131 : 25 Bq/Kg

    Sample 2
    Sample taken 7/18/2012
    219 km from Fukushima plant
    Iodine 131 : 13 Bq/Kg

  4. Thanks for the heads up; it is just as predicted. Assuming they keep accurately reporting the data, there will likely be a big jump in Iodine 131 reported in the Japanese sewage correlated to the larger fallout event we detected here in STL on 8/8/12