One Year Later: Neptunium-239 findings 35km from Fukushima meltdowns published in journal — Decays into Plutonium-239

Published: March 5th, 2012 at 2:34 pm ET
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Title: Deposition of fission and activation products after the Fukushima Dai-ichi nuclear power plant accident
Source: 10.1016/j.envpol.2012.01.001 : Environmental Pollution
Authors:
Katsumi Shozugawaa, a Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
Norio Nogawab, Radioisotope Center, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japans
Motoyuki Matsuoa, a Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
Date: April 2012

The Great Eastern Japan Earthquake on March 11, 2011, damaged reactor cooling systems at Fukushima Dai-ichi nuclear power plant. The subsequent venting operation and hydrogen explosion resulted in a large radioactive nuclide emission from reactor containers into the environment. Here, we collected environmental samples such as soil, plant species, and water on April 10, 2011, in front of the power plant main gate as well as 35 km away in Iitate village, and observed gamma-rays with a Ge(Li) semiconductor detector. We observed activation products (239Np and 59Fe) and fission products (131I, 134Cs (133Cs), 137Cs, 110mAg (109Ag), 132Te, 132I, 140Ba, 140La, 91Sr, 91Y, 95Zr, and 95Nb). 239Np is the parent nuclide of 239Pu; 59Fe are presumably activation products of 58Fe obtained by corrosion of cooling pipes. The results show that these activation and fission products, diffused within a month of the accident.

Read the abstract here

h/t EXSKF

Published: March 5th, 2012 at 2:34 pm ET
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35 comments

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