Edward Willett

Archives

Nuclear testing

With the explosion of "nuclear devices" (aka "bombs") in the past couple of weeks, India and Pakistan have joined the "nuclear club," and also, alas. brought nuclear weapons into the forefront of the news for the first time in years. So perhaps it's time for a little refresher course on just how a nuclear bomb works--and how (and why) it's tested. The original atomic bomb, exploded on July 16, 1945, near Alamagordo, New Mexico, by the United States, was a fission bomb. Nuclear fission was discovered in 1938 by the German physicists Otto Hahn and Fritz Strassmann, who split the nuclei of uranium atoms by bombarding them with neutrons (uncharged particles that make up atomic nuclei along ...

Posted by Edward Willett at 17:22, June 2nd, 1998 under Blog, Columns, Science Columns | Comment now »

Fusion

Nuclear fusion as an electrical power source is rather like some people's plans for after they win the lottery. They're sure it's coming, and they're sure it's going to be great, but somehow it never seems to happen. Actually, that's not a very fair comparison, because nuclear fusion really does seem to be on the way, while most people will never get rich in a lottery. On the other hand, a lot of lottery winners will have come and gone before fusion finally becomes a viable energy source. However, on still another hand (hmm, that makes three), almost all of our present energy sources are ultimately derived from nuclear fusion, ...

Posted by Edward Willett at 22:56, November 20th, 1991 under Blog, Columns, Science Columns | Comment now »

Fission

We sometimes talk about living in the Nuclear Age, because it has only been in the last 50 years that we have managed to harness the power expressed by Einstein as E=mc2. But strictly speaking, uranium fission, which is what we think of when we think of nuclear power, isn't new. About 1.78 billion years ago (give or take a few million years) there was enough uranium trapped in the rock near Gabon, West Africa, for a chain reaction to begin on its own. For a million years, Gabon was home to the world's first nuclear reactor. Still, we egotistical humans don't really pay much attention to things that happened ...

Posted by Edward Willett at 11:01, November 13th, 1991 under Blog, Columns, Science Columns | Comment now »