April 8th, 2011 – Fukushima NPP Radiation Health Risks v.1

On-site at the Fukushima Daiichi plant, radiation levels in certain areas continue to be life-threatening -30 Sv/hr (3,000 R/hr) in the dry wells for units 1 and 2 and 20 Sv/hr (2,000 R/hr) near the drywell of unit 3.

Additionally, debris has been located outside of the reactor building of unit 3 with radiation levels measuring 1 Sv/hr (100 R/hr)

The largest radiation plume was observed to pass in the north-west direction as confirmed by MEXT radiation monitoring results.  Four clusters of exposure data were plotted based on 89 measurement locations supplied by MEXT.

The exposure rates plotted were spread across the west, northwest, and south and a tight cluster of locations to the northwest.

The highest exposure rates were in the northwest cluster and have been slowly decreasing from the high of 170 pSv/hr, 30km from the Fukushima Daiichi plant.

Deposition of these radionuclides in leafy vegetation, measured at the same locations, are consistently higher than in soil, and show a high value of 300,000 Bq/kg for 1-131 and 1,440,000 Bq/kg for Cs-1 37 at a distance of 40 km (24.8 miles) northwest of the site.


Summary of Radiological Hazards in Japan – Pages From C141933-02BX-23

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