ずくなしの冷や水

2013年の晩春に米国サンジェゴ沖で採取された海水中のヨウ素129（半減期1570万年でキセノン129になる）のヨウ素131比が福島第一原発事故直後に福島第一原発沖40kmで採取された海水のそれよりも2.5倍以上高く、福島第一原発事故前のサンジェゴのバックグラウンドに比べて2桁高かった。

ENENEWS2017/1/23
Experts: US hit with sudden spikes of rare radioactive material from Fukushima − Has 15.7 Million year half life − “Orders of magnitude” rise in levels on West Coast − Much higher amounts than were detected near Fukushima plant just after 3/11

Royal Society of Chemistry, National Institute for Physics & Nuclear Engineering, Romania, 2015 (emphasis added): AMS analyses of I-129 from the Fukushima Daiichi nuclear accident in the Pacific Ocean waters of the Coast La Jolla, San Diego, USA − This paper presents the results of an experimental study we performed by using the Accelerator Mass Spectrometry (AMS) method with iodine 129 (Halflife = 15.7 Million years], to determine the increase of the radionuclide content in the USA West Pacific Coast waters, two years after the March 2011 Fukushima Daiichi nuclear power plant accident… The results of the experiments showed a significant increase of the radionuclide concentration during the late spring of 2013. Compared to the isotopic ratio 129I/127I, measured at a 40 km distance, offshore of Fukushima and immediately after the accident, our results show an increase on the USA West Coast that was more than a 2.5 factor higher. Also, compared with the pre-Fukushima background values [in San Diego], our results show an isotopic ratio of about two orders of magnitude higher…