Study: High plutonium-241 activity detected over 30 kilometers from Fukushima plant — Additional research suggests “long-distance transport” of plutonium

(Source) http://enenews.com/study-high-plutonium-241-activity-detected-30-kilometers-fukushima-plant
Title: Release of plutonium isotopes into the environment from the Fukushima Daiichi nuclear power plant accident: what is known and what needs to be known
Source: Environmental Science & Technology (American Chemical Society)
Authors: Jian Zheng, Keiko Tagami, and Shigeo Uchida
Date Published: July 31, 2013
[...] 238Pu/239+240Pu activity ratios (0.33-2.2) higher than that of global fallout (0.026) were detected at five sites, indicating a possible distribution of Pu related to the accident northwest of the FDNPP. Similarly, using the alpha counting technique, a field survey was made soon after the accident in some heavily contaminated areas outside the 20 km exclusion zone, as well as in Okuma Town adjacent to the plant. The anomaly of the 238Pu/239+240Pu activity ratios (0.059-2.60) indicated the presence of trace amounts of Pu isotopes originating from the accident in soils from Iitate Village and Okuma Town. […][...]