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Study: Australia ranks highest for nuclear materials' safety, North Korea takes last place

Australia is the safest, N Korea is the most dangerous, nuclear study finds.

Japan: Probe finds Fukushima reactor still has lethal radiation levels

Dangerously high radiation, low cooling water levels found at reactor No. 2.

A workers is given a radiation screening as he enters the emergency operation center at Fukushima Dai-ichi nuclear power station in Japan. Japan ranked 23rd in a new study which looked at the safety of the 32 nations that possess nuclear materials.

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