Since the March 11 earthquake that ravaged northern Japan, workers at Fukushima Daiichi have been struggling to cool down three overheated reactors and keep pools of spent but still potent nuclear fuel from spreading further radioactive contamination across northern Japan.

CNN: STORY HIGHLIGHTS

But with the Fukushima nuclear disaster in 2011 rumors spread of radioactive contamination of many Japanese products.

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In early May, a study by Ireland's nuclear watchdog - the Irish Radiological Protection Institute -claimed that radioactive discharge from Sellafield continued to be the dominant source of contamination in the Irish Sea.

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