Insight: Japan's nuclear clean-up: costly, complex and at risk of failing
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The most ambitious radiation clean-up ever attempted has proved costly, complex and time-consuming since the Japanese government began it more than two years in the wake of the Fukushima nuclear meltdown. It may also fail.

Doubts are mounting that the effort to decontaminate hotspots in an area the size of Connecticut will succeed in its ultimate aim - luring more than 100,000 nuclear evacuees back home.

If thousands of former residents cannot or will not return, parts of the farming and fishing region could remain an abandoned wilderness for decades.

In many areas, radiation remains well above targeted levels because of bureaucratic delays and ineffective work on the ground. As a result, some experts fears the $15 billion allocated to the scheme so far will be largely squandered.