On 2002-05-29 10:54, firemind wrote:
On 2002-05-29 10:39, walterhoch wrote:
But in some cases the technology is already here for an environmental clean-up: I remember an NPR report some years ago about a scientist (at Carnegie-Mellon or Penn State maybe?)who could take any toxic chemical, no matter how long the formula, and break it back down into its basic elements by melting it in a centrifuge filled with liquid steel.
Even nuclear waste could be handled this way.
As a former physicist, I have to object to that bit about nuclear waste. That does NOT sound right.
It is true that applying extreme temperatures can break down hazadous chemicals into their component atoms. Similar suggestions involving plasma torches have been made. The process is expensive, however, which is probably one of the reasons it isn't widely used.
I've been away from the field for a while, but as for radioactive nuclei, I would be surprised if merely applying heat at temperatures of liquid steel would eliminate the radioactivity.
Radioactive nuclei are unstable nuclei. They undergo nuclear reactions, breaking down, until all of the nuclei have reached a stable structure. Each reaction emits energetic particles (radiation) which can damage living cells.
I guess I could believe that heating the nuclei would make this process go faster, but not appreciably faster, not enough to make it worth it.
<font size=-1>[ This Message was edited by: firemind on 2002-05-29 10:57 ]</font>