For seven generations, Yoshitoshi Sewa and his ancestors have tilled this farm in a gently curving valley filled with green rice paddies. But now he will not let his young grandchildren play outside their tile-roofed home for fear of an invisible and potentially long-lasting threat, radiation.

Yoshitoshi Sewa, a farmer, in his home in Tenei, 40 miles from Japan's stricken nuclear plant.

Hitachi Ltd and Mitsubishi Heavy Industries Ltd will explore bolstering ties over Japan's stricken Fukushima Daiichi nuclear power plant, as Hitachi looks to win a multibillion dollar contract to scrap its damaged reactors.

Hitachi and rival Toshiba Corp each submitted separate proposals for the long-term decommissioning of the hobbled nuclear plant earlier this month, a process experts say cou

Everyone knows about Chernobyl, Three Mile Island and, now, Fukushima. But what about Semipalatinsk, Palomares and Kyshtym? The world is full of nuclear disaster zones -- showing just how dangerous the technology really is.

The Chernobyl disaster still has much to tell us about the long-term risks of low-level radiation exposure. But only if the necessary follow-up studies are supported. (Editorial)

Reassurances from ‘experts’ on the safety of nuclear power will not wash,
says Colin Macilwain. The Fukushima crisis raises genuine questions.

In a week that has seen little good news about the stricken Fukushima Daiichi nuclear reactors, the latest data on radioisotope fallout from the plant is so far offering a glimmer of hope.

Twenty-five years after the nuclear disaster, the clean-up grinds on and health studies are faltering. Are there lessons for Japan?

On March 11th, Japan was hit by one of the biggest natural cataclysms ever observed – a magnitude 9 earthquake on the Richter scale and a tsunami with a wave more than 10 meters high. The tsunami has resulted in a serious nuclear accident in the Fukushima power plant operated by the Japanese utility Tepco.

Peter Walker
Ukraine announces official tours of the 1986 nuclear disaster site.

LESSONS FROM AN ACCIDENT: Visitors can now learn more about the tragedy. A 2007 file photograph of the abandoned town of Pripyat and the now closed Chernobyl nuclear power plant in the background.

Already been to North Korea? Hiking in Afghanistan too last year? Fear not.

The short-term effects on the lung and pulmonary system following acute high-dose exposure to radiation are relatively well known. However, there has been comparatively little research on the long-term health effects of radioisotope exposure on the respiratory system.