Tuesday, April 10, 2012

Radioactive particles from Japan detected in California kelp

L A Times
April 10, 2012



Fukushima Daiichi nuclear power station
Radioactive particles released in the nuclear reactor meltdown in Fukushima, Japan, following the March 2011 earthquake and tsunami were detected in giant kelp along the California coast, according to a recently published study.
Radioactive iodine was found in samples collected from beds of kelp in locations along the coast from Laguna Beach to as far north as Santa Cruz about a month after the explosion, according to the study by two marine biologists at Cal State Long Beach.
The levels, while most likely not harmful to humans, were significantly higher than measurements prior to the explosion and comparable to those found in British Columbia, Canada, and northern Washington state following the Chernobyl disaster in 1986, according to the study published in March in the journal Environmental Science & Technology.
Giant kelp, or Macrocystis pyrifera, is a particularly good measure of radioactive material in the environment because it accumulates iodine, researchers said. They wrote that radioactive particles released into the atmosphere, in particular radioactive isotope iodine 131, made its way across the Pacific, then was likely deposited into the ocean during a period of significant rain shortly after the meltdown in Japan.
The highest levels were found in Corona del Mar. Researchers wrote that the levels were probably highest there because the kelp is also exposed to urban runoff, which may have increased the amount of rainfall it received.
The study’s authors said that while the effect of radioactive material in kelp is not well known, it would have been consumed by organisms that feed on the kelp such as sea urchins or crustaceans. Certain species of fish, including opaleye, halfmoon or senorita may be particularly affected because their endocrine systems contain iodine, according to researchers.

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