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| | IEER Publications: Fissile Materials in a Glass, Darkly |
 | | Certain fissile materials, such as natural uranium and low enriched uranium, cannot be used to make nuclear weapons since they cannot be assembled into supercritical masses in which the chain reaction grows so rapidly that there is a large and very sudden energy release -- that is, there is an explosion. |
 | | Practically speaking, there are only three weapons-usable fissile materials, plutonium, highly enriched uranium (made from natural uranium), and uranium-233, which does not occur in nature, whose man-made stocks are very small relative to plutonium and HEU, and which has not been used in nuclear weapons, so far as public data indicate. |
 | | The present global predicament with respect to weapons-usable fissile materials, whose half-lives are far greater than the longevity of human institutions, has arisen in large measure because governments and their nuclear establishments did not even consider the question of what future generations might do with these materials, if society did not want them. |
| www.ieer.org /pubs/fissmats.html (1786 words) |
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