Study: Radioactive ‘black rain’ HELPED Japan after meltdowns — Substantial amount of fallout was floating near ground, and rainfall “ceased its re-suspension” — Area was at “High Risk” beforehand

Published: April 25th, 2012 at 1:02 pm ET
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Title: Radioactive contamination processes during 14-21 March after the Fukushima accident: What does atmospheric electric field measurements tell us?
Source: Geophysical Research Abstracts
Authors:
M. Yamauchi, Swedish Institute of Space Physics, Kiruna, Sweden
M. Takeda, Data Analysis Center for Geomagnetism and Space Magnetism, Kyoto University, Japan
M. Makino, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
T. Owada, Kakioka Magnetic Observatory, Japan Meteorological Agency, Ishioka, Japan
Date: 2012

[...] We compare the Kakioka’s PG data [150km SW of Fukushima Daiichi] with the radiation dose rate data at different places to examine the fallout processes of both on 14 March and on 20 March. The former turned out to be dry contamination by surface wind, leaving a substantial amount of fallout floating near the ground. The latter turned out to be wet contamination by rain after transport by relatively low-altitude wind, and the majority of the fallout settled to the ground at this time. [...]

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Title: press-Yamauchi-handout.pdf (application/pdf Object)
Authors: Yamauchi et al. (oral) & Takeda et al. (poster)
Date: Apr 21, 2012

(1) 12-24 March: Large radioactive plumes carried by the surface wind.
(2) 14 March: Dry deposition on 14 March at Kakioka, 150 km south of the FNPP-1.
(3) 16-20 March: Strong re-suspension by wind.
(4) 12-20 March: Highest risk of internal dose, particularly for children.
(5) 20-21 March: Wet deposition at Kakioka by the first substantial rain. The rain ceased re-suspension.
(6) ~ 20 April : Re-suspension by daily wind and transport, from highly-contaminated to moderately-contaminated areas.
(7) ~ summer 2011: minor plumes from the FNPP-1.

Read the handout here

Published: April 25th, 2012 at 1:02 pm ET
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