To return to the nuclear decay analogy, Plutonium-239
always has a half-life of a little more than 24,000 years.
These neutrons convert the depleted uranium into plutonium-239
(breeding), which is then fissioned (burned) to produce energy.
5 lb) of plutonium-239
a year by 2014, after which it could produce one atomic bomb per year.
Bomb: Codenamed Fat Man, it was made mainly of plutonium-239
and created a 21-kiloton blast.
A Congressional Research Service report on the threat pointed out that dirty bomb components are easier to detect than biological, chemical and even weapons-grade nuclear materials such as highly enriched uranium or plutonium-239
The committee has drafted plans for consolidating and disposing of plutonium-239
and for disposing of uranium-233.
She presents a carefully researched and well-written travelogue that allows the reader to feel the atmosphere in what has become Europe's largest wildlife sanctuary, with wild boars and other endangered species living in the forests, fields and swamps, despite the contamination with cesium-137, strontium-90 and plutonium-239
A reactor core full of spent fuel may contain dozens of kilograms of U-235, and several kilograms of plutonium-239
The half-life of Plutonium-239
, as given in the Merck Index, is 24,110 years.
To create a repository that can safely contain deadly plutonium-239
(with a half-life of 24,000 years), one must find a geologic environment that has been stable for at least a quarter-million years.
For example, plutonium-239
takes 240,000 years to lose 99 per cent of its radioactivity.
From the early 1950s through the 1970s, some 150,000 tons of uranium, containing plutonium-239
and larger amounts of equally dangerous neptunium-237, were recycled from nuclear-weapons production reactors and processed at the three gaseous-diffusion plants.