Detected in Helsinki, Finland in October 2015:
- Actinium-225 & 227:
- Cobalt-60, here shown with a repeat of the Ac-225 data:
- Likely unrelated, but noteworthy nonetheless: In Northern Germany (perhaps the only region that monitors for this isotope publicly (?)): just the othe day, a (rare!) detection of Zirconium-97 , here shown together with data for Bismuth-214:
What is Ac-225, Ac-227, Co-60 and Cs-134/137 blowing together in a whiff of apparently radioactively polluted air in Finland? I don’t know.
Also looked at:
Flashback to May 2015
One of the things I find interesting is that the last time Zr-97 was detected it was in Angermünde, which at the time I assumed was the only Zr-97 monitor. So clearly, there’s more, but they don’t show up unless something is detected. This time it was at Hamburg-Fuhlsbüttel.
Now, here’s the striking correlation: Last time (See extra details in June 6, 2015’s “Pink Unicorns beach themselves on the shores of Lake Dystopia“ and June 7, 2015’s Yup… Fukushima is Still Fissioning – A Nullschool Wind Data Analysis of May 2015 EURDEP-Finland/Germany Radioactive Air Samples), Finland observed I-131, Co-60, Nb-95, Ru-103, Cs-134, Cs-137 in the sample period May 22-25, 2015 (@ Kotka in the south, and @ Rovaniemi in the north), and Zr-97 was detected just 10 days prior in Northern Germany: May 12-13, 2015.
Given Zr-97 has a half-life of only 16.744 hours, and in 11 half-lifes it’s no longer Zr-97, which makes it an indication of very recent fission. To refresh my memory, here’s the record of the previous detection:
“This means, with no room for doubt unfortunately, that a neutron-spewing Uranium-Fission event occurred at the very most 8 days before May 12, 2015.
A little quote from http://en.wikipedia.org/wiki/Nuclear_fallout#Half-life:
“[…] A large amount of short-lived isotopes such as 97Zr are present in bomb fallout. This isotope and other short-lived isotopes are constantly generated in a power reactor, but because the criticality occurs over a long length of time, the majority of these short lived isotopes decay before they can be released. […]”
The latter to which I would like to add: UNLESS, of course, you’re dealing with a completely out-of-control open-air reactor sinking into a Pacific Ocean beach… […]”
The same applies to the October 25-26, 2015 detection of Zr-97. And the October 9-10, 2015 sample period during which Ac-225, Ac-227, Co-60 and Cs-134 & Cs-137 were detected was just about 2 weeks before that.
CONCLUSION: It is not impossible that a significant nuclear fission accident somewhere took place this month of October, spanning several weeks. Given what I’ve found in the past, however, I consider it just as likely that Fukushima is having some more flare-ups underground.
Maybe we will never find out…
Yet, strikingly again: All this data was VALIDATED. Some unusual release occured. There is no doubt about that. Where it came from, however, would take massive amounts of time to figure out (using Nullschool, etc.). But it is known at the top data access levels of the CTBTO & IAEA, who remain as silent as ever…
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