VIENNA - Minuscule amounts of radioactive particles believed to have come from Japan's Fukushima nuclear power plant have been detected on the US west coast, two diplomatic sources said on Friday.
The level of radiation was far too low to cause any harm to humans, they said. One diplomat, citing information from a network of international monitoring stations, described the material as "ever so slight," consisting of only a few particles.
"They are irrelevant," the diplomat added.
Another diplomatic source also said the level was "very low".
The Comprehensive Test Ban Treaty Organization (CTBTO), a Vienna-based independent body for monitoring possible breaches of the test ban, has more than 60 stations around the world, including one in Sacramento in California.