Last August Katsumi Shozugawa of Tokyo University stated that he detected Neptunium239 in Iidate, Fukushima prefecture and that it would be published in an international science journal. As a result he received lots of harassing tweets every day that made his stomach twist. He stopped tweeting for days and stopped referring to the subject all together.
Supposedly it was published last fall in an undisclosed publication, however in January 2012 Shosugawa's research paper "Deposition of fission and activation products after the Fukushima Dai-ichi nuclear power plant accident" was published as a paid downloadalble PDF at Elsevier Science http://www.sciencedirect.com/science/article/pii/S0269749112000024
The following is a brief abstract of Shosugawa's paper:
"We observed activation products ((239)Np and (59)Fe) and fission products ((131)I, (134)Cs ((133)Cs), (137)Cs, (110m)Ag ((109)Ag), (132)Te, (132)I, (140)Ba, (140)La, (91)Sr, (91)Y, (95)Zr, and (95)Nb). (239)Np is the parent nuclide of (239)Pu; (59)Fe are presumably activation products of (58)Fe obtained by corrosion of cooling pipes. The results show that these activation and fission products, diffused within a month of the accident."
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