Reno (Nevada): Extremely small amounts of radiation have reached Las Vegas from Japan’s earthquake and tsunami stricken nuclear plant, but scientists say it poses no health risk.

Miniscule amounts of the radioactive isotopes iodine-131 and zenon-133 reached a monitoring station by the city's Atomic Testing Museum this week, said Ted Hartwell, manager of the Desert Research Institute's Community Environmental Monitoring Program.

Hartwell said he's certain that the isotopes came from Japan because they're not usually detected in Nevada. But he said the readings were far below levels that could pose any health risks.

"Unless you have an accident like this (in Japan) you wouldn't expect to see this. No doubt it's from Japan," Hartwell told a news agency.

Tiny amounts of radiation from Japan have been reported in the West, including California, Colorado, Hawaii and Washington. Officials have said those levels also were not harmful.

Nevada health officials have said they do not expect any risk to the state from Japanese radiation releases because of the distance the materials would have to travel.

"Any material released must travel 10,000 miles across the Pacific Ocean, during which time it will be dispersed and diluted in the atmosphere to levels that might eventually be detectable, but which will not present a health hazard nor require any protective actions," said Eric Matus, radiation physicist for the Nevada State Health Division.

Scientists say they weren't surprised that radioactive isotopes from Japan were detected in the Western states. "They get caught up in the right wind pattern and they'll move across the ocean," said Jeff Daniels, an environmental scientist with Reno-based DRI.

Small amounts of the radioactive isotope cesium-137 were detected at a University of Nevada, Las Vegas laboratory between March 17 and 21, but haven't been reported since then, Hartwell said.

(Agencies)