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Radioactive Iodine-131 in rainwater sample near San Francisco 18,100% above federal drinking water standard....
For example, in the rain water we collected in 18 hours between March 17 and March 18 we observe an activity of the isotope of I-131 (Iodine-131) of 4.26 Bq/l. At this level, you would need to drink 632 liters of this rain water to obtain the same radiation effects you obtain on a round-trip flight between San Francisco and Washington D.C. Therefore, the increase in radiation levels in the rain water due to the events in Japan remain extremely small.