Excerpt on Radiation from IAEA Briefing on Fukushima Nuclear Accident (7 April 2011, 18:00 UTC)

On 6th April, low levels of deposition of both I-131 and Cs-137 were detected in 4 and 6 prefectures respectively. The values reported for I-131 ranged from 3.4 to 10 becquerels per square metre, for Cs-137 from 4.9 to 19 becquerels per square metre. Gamma dose rates continue decreasing . There is no significant change in gamma dose rates reported for 6th April compared to yesterday. As of 5th April, I-131 and Cs-134/137 was detectable in drinking water in a small number of prefectures. All values were well below levels that would initiate recommendations for restrictions of drinking water. As of 6th April, one restriction for infants related to I-131 (100 Bq/l) is in place as a precautionary measure in only one village of the Fukushima prefecture. TEPCO is responsible for near-shore sampling, taking samples of surface seawater. Samples near discharge areas are collected daily. Until 3rd April a general decreasing trend was observed. However, after the discharge of contaminated water at 4th April, an increase from about 11 kBq/l as measured at 09:00 to 41 kBq/l at 14:00 for I-131; from 5 ...Zum vollständigen Artikel

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