The road passed less than 40 miles from the plant; the prospect of driving through a radioactive cloud was horribly imaginable.

A radioactive cloud would spread more than 150 miles around the plant.

Planets were surrounded suddenly by radioactive cloud masses.

The radioactive cloud formed headed due east.

Now, as survivalist options, they have to be both remote (well away from radioactive clouds) and in touch.

In an alphabetical list of the chemical elements, which radioactive metal comes first?

A soft, silvery-white radioactive metal, actinium reacts rapidly with oxygen and moisture in air forming a white coating of actinium oxide that prevents further oxidation.

Hydrocarbons are by far the most common source of fuel used by humans, but other substances, including radioactive metals, are also utilized.

As a result, their breathe-gas explodes on contact with even trace amounts of radioactive metals, such as uranium.

Last night one of the plant's reactors leaked water which turned to radioactive sludge.

But if the fuel or radioactive sludge dried out, there's a risk of airborne contamination and that could take the [contamination] activity off site.

On the other side of the wall, beneath the surface of the water, lie 1,500 tonnes of radioactive sludge and 1,300 skips that contain corroding spent nuclear fuel.

It corroded, forming the radioactive sludge.

However, a substantial amount of residue remains in the older single shell tanks with one containing an estimated 447,000 gallons of radioactive sludge, for example.

Explain the risk to the patient of using a radioactive substance as a medical tracer.

Experts said that they did not expect to find evidence of the radioactive substance.

The studies showed that the hyperplastic thyroid gland absorbed more of the radioactive substance than the normal gland.

In this procedure, the doctor injects a dye or radioactive substance near the tumor.

The radiation can be emitted by a radioactive substance or generated electrically.

Teams of workmen discovered that highly radioactive water had collected in three of the reactors, complicating their task.

Three engineers volunteered to dive into the radioactive water to drain the basement.

However, there are concerns that rainfall of up to 19cm (7.5in) could have forced radioactive water from the nuclear plant into the sea.

This time, about 430 litres of radioactive water spilt from a storage tank after workers overfilled it.

There were meltdowns in three reactors at the plant following the 2011 earthquake and tsunami, with radioactive water stored in tanks.