Extremely high levels of radioactive sewage have been detected in Japan sewer systems according to reports from JiJi press, NHK and other Japanese news agencies. The high levels of radioactivity are believed to be caused by the rain collecting radioactive substances from the ground during runoff and then carrying the contaminates into the sewer system. Complicating the matter further is the levels of radiation in the sewage concentrates to even higher levels once the raw sewage is processed into sludge at local processing factilities.
Raw sewage measured at one local processing facility contained 26,400 becquerels of radioactive cesium per kilogram. While this is an extremely high level of radiation once processed into sludge the level of radioactive cesium was measured to contain 334,000 becquerels of cesium per kilogram. link
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