Japan's Radiation In US From Contaminated Steam And Not Spent Fuel Rods Or Reactor Material

From ScienceNews, "Japan nuke accident seen from Seattle: Clues to events at crippled plant found in traces of radiation reaching Pacific Northwest" by Devin Powell:

Radioactive particles wafting eastward over the Pacific Ocean from Japan have been spotted in Seattle and used by a forensic team of physicists as a window into recent events inside the crippled Fukushima Daiichi nuclear plant 5,000 miles away. Working backward from these nuclear byproducts, the physicists have confirmed that contaminated steam is the source of this radiation, not spent fuel rods or material ejected directly from the reactor core.

Read the complete ScienceNews post here.