We have observed fallout from the recent Fukushima Dai-ichi reactor accident in samples of rainwater collected in the San Francisco Bay area. Gamma ray spectra measured from these samples show clear evidence of fission products--(131,132)I, (132)Te, and (134,137)Cs. The activity levels we have measured for these isotopes are very low and pose no health risk to the public.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3177818 | PMC |
| http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0024330 | PLOS |
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