Title: Canopy-Forming Kelps as California’s Coastal Dosimeter: 131I from Damaged Japanese Reactor Measured in Macrocystis pyrifera (ACS Publications)
Source: Environmental Science & Technology
Author: Steven L. Manley and Christopher G. Lowe, Department of Biological Sciences, California State University
Publication Date (Web): March 6, 2012
[...] Macrocystis is the keystone species supporting the kelp forest ecosystem, which is highly productive with complex community structure. Using a canopy density of 3.5 kg fresh weight m−2, the amount of 131I present in California kelp ranged from 0.3 to 1.3 kBq m−2 of canopy.11 Our estimate of the area covered by the Corona del Mar Macrocystis canopy was 33 000 m2 yielding a total of 40 MBq 131I sequestered into this kelp bed canopy. The total amount of 131I taken up by the canopy was most likely larger than that measured in the canopy tissue because iodine taken up by canopy blades is translocated throughout the kelp body as iodide. [...]
40MBq is 40 megabecquerels, or 40,000,000 Bq.
Here’s how ‘Scientific American’ reported the study’s findings in the article Radioactive Iodine from Fukushima Found in California Kelp:
The scientists estimated that the entire kelp tissue on the surface at Corona del Mar contained about one millicurie.
Published: March 30th, 2012 at 5:46 pm ET
- Southern California had 2,500 Bq/kg of iodine-131 in seaweed — Over 500% higher than other tests in U.S., Canada March 30, 2012
- Study: Fukushima radiation plume contacted North America at California ‘with greatest exposure in central and southern California’ March 29, 2012
- AOL: “Just How Dangerous Is Radioactive Kelp?” — Scientists say nuclear waste in kelp beds off California coast is from Fukushima (VIDEO) February 4, 2014
- Study Author: California iodine-131 probably double or triple what we reported April 5, 2012
- Professor: “Reports of radiation in kelp just north of California” — Signs of Fukushima contamination expected to start “really arriving strongly” this year January 21, 2014