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Greenpeace, the conservation group, issued a statement saying the presence of these isotopes suggested cesium 137 was also released.

Independent newspaper Novaya Gazeta reported traces of cesium 137 were detected in the emergency room area an hour after the patients were brought in, forcing the area to be decontaminated.

An hour later, traces of cesium 137 were detected in the ER, which then had to be decontaminated.

Evacuations continued for months as Japan struggled to find housing for a large population exposed to radioactive iodine 131, cesium 134 and cesium 137.

The three isotopes in question are cesium 137 and plutonium 239 and 240, which will take millennia or more to decay.