Feb. 18, 2016 – DISCLAIMER
Wondering if I could find an additional clues to where that mid-January Ruthenium-103 detection near Oslo, Norway might have come from, I was browsing through some Cesium-137 monthly data… It’s just some data. Could come in handy as a reference at some point, perhaps. Figured I might as well turn it into a blogpost.
You can see the data gaps when it matters most, and upticks long after things where declared “back to normal”. Apart from that, there’s not all that much to see. In the graphs below, the dots are the center of a sampling period that’s usually about a week. Dates at the beginning and/or end may repeat themselves. (So what looks like a data gap here isn’t always one.) Pull up the detailed data via EURDEP’s Public “advanced map” yourself for more details.
The radiosiotope-specific radiation monitoring record in Sola, Norway begins just before the beginning of the Fukushima-Daiichi Nuclear Disaster began, with what looks like a couple tests in January and February 2011:
Before the radioactive cloud reached Europe, we get an idea of some values that could be close to “background” (as a result of nuclear bombings, and other nuclear “accidents”, like Chernobyl, all of which have laced the atmosphere with Cesium-137 (half-life: about 30 years). Then -poof- there’s no data until the middle of April 2011:
The part that’s off-scale above, is shown again, below, with the y-axis adjusted:
By June 2011, Cs-137 already seem to have normalized…
But that’s one of the deceptions. Many more whiffs were still to come…
Most of the data shown here is ‘validated’, but a couple high values, such as this spike in spring 2012 wasn’t ‘validated’ (which doesn’t mean it wasn’t real, though…):
The record continues in summer 2012 with what looks like a return to “normal”…:
until significant upticks return, again in winter. Quite pronounced in Dec. 2012 through Feb. 2013:
And things quiet down again…
Winter 2013-2014 is relatively quiet, though:
A slightly higher-than-usual uptick in mid-March 2015:
An apparent spike in mid to late August 2015:
And most recently rising to a value that also slightly higher than average. That week of the peek value in mid-January (2016), Ruthenium-103, a sign of recent fission, was detected in Norway as well (See Ruthenium-103 Detected in Norway (in mid-Jan. 2016));
No data has been released since (time of checking: Feb. 18, 2016).