Thursday, May 23, 2013

Researchers find high cesium in some Pacific plankton

A group of Japanese scientists have revealed on Tuesday that they have seen high levels of radioactive cesium, presumably from the Fukushima No. 1 nuclear plant, in samples of Pacific Ocean plankton collected from 10 areas in the Pacific that they have checked, the highest levels found at a location 25 degrees north latitude and 150 degrees west longitude.

The team of researchers collected the plankton at 10 points in the Pacific, ranging from just of the coast of Japan in Hokkaido all the way to Guam, between January and February 2012. The samples showed amounts of cesium-134 in plankton at all 10 sample areas. The density of radioactive cesium was at the highest levels, around 8.2 to 10.5 becquerels per kilogram, in plankton samples collected at around 25 degrees north latitude and 150 degrees east longitude, an area of the ocean around 560 miles northeast of Honolulu, and 2,000 miles southwest of Los Angeles. The lowest concentration at any of the 10 points was 1.9 becquerels per kilogram.