Radiation from Japan’s 2011 nuclear disaster has spread off North American shores and contamination is increasing at previously identified sites, although levels are still too low to threaten human or ocean life, scientists said on Thursday.

Tests of hundreds of samples of Pacific Ocean water confirmed that Japan’s Fukushima nuclear power plant continues to leak radioactive isotopes more than four years after its meltdown, said Ken Buesseler, marine radiochemist with the Woods Hole Oceanographic Institution.

Trace amounts of cesium-134 have been detected within several hundred miles (km) of the Oregon, Washington and California coasts in recent months, as well as offshore from Canada’s Vancouver Island.

Another isotope, cesium-137, a radioactive legacy of nuclear weapons tests conducted from the 1950s through the 1970s, was found at low levels in nearly every seawater sample tested by Woods Hole, a nonprofit research institution.

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