YDINPOMMIIN riittää, kun pudotetaan uraanipala toisen päälle
NÄIN uskomattomia väittää Nobel-ydinfyysikko Luis Alvarez .....
alkuperäisiä Manhattan-projektin fyysikoita ... ( Lainaus uudesta SciAmista ). EI ole terroristeille turha vaikeaa ... !!!
The “quality” of nuclear material since then has continued to improve, however, so much so that in 1987 Nobel laureate physicist and Manhattan Project scientist Luis Alvarez noted that if terrorists had modern weapons-grade uranium, they “would have a good chance of setting off a high-yield explosion simply by dropping one half of the material on the other half.” To test that assertion, we modeled the difference between the Little Boy design and an improvised nuclear device as crude as the one Alvarez described.
We again used the Los Alamos software code and modeled the yield of Little Boy on publicly available design information, as well as two simple configurations of HEU in a gun assembly. Our modeling showed that, for an explosive-driven gun assembly, the minimum quantity that was required to obtain a one-kiloton explosive yield would be substantially less than the amount of HEU in Little Boy. Most disturbingly, with larger quantities, a one-kiloton yield could be achieved with a probability greater than 50 percent by dropping a single piece of HEU onto another, confirming Alvarez’s statement. Designing an HEU bomb seems shockingly simple. The only real impediment, therefore, is secretly gathering sufficient material.
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