The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: email@example.com (StevJensen)
Date: 31 Oct 2002 04:44:49 GMT
Organization: AOL http://www.aol.com
Subject: Re: eer
>wrote (in <firstname.lastname@example.org>) about 'eer', on
>Wed, 30 Oct 2002:
>>For how long would it be more energetically active?
>>You note that the energetic isotopes have short half lives.
>The well-known 10000 years is in the right ball-park.
At best that seems to be a grand oversimplification.
The charts I have seen show uSec, hours and days for many isotopes.
When you get up in the 10k year range then they seem to prevalent
in the environment anyway. (i.e.: Natural - another buzz word)
>>It seems, at least to me, that it must be missing something in the energy
>>department, otherwise there wouldn't be any point in removing the
>Its heat-generation is *uncontrollable*, unlike that of the original
>fuel. This is a *good* reason to eliminate it!
That sounds reasonable. Could they let them sit around for a few years
and then put them back in after the worst of the really short lived stuff
pops off? It would be my understanding that perhaps half of the original
U still remains in them.
>>A page on Google lists a half life of something around 200k years for
>>Pu239. If I had a block of it hidden on my desk would I be able to
>>tell it was there by measuring an increase in the background radiation?
>>Would I have to know exactly what the original background was
>>or would it be obvious?
>How big is the 'block'? A sugar-cube sized block would certainly give
>levels well above background. A brick could be above critical mass for
>the fission chain reaction, so as to eliminate your desk, you and much
>of the surrounding countryside.
Well, there might be an issue with getting a 10kg brick to my desk in the
first place. But for say a 10g sized block, if I tossed a sheet of tin foil
over it (or even if I didn't) would there be a real reason to care as long as I
avoided direct contact? In other words how close would a measurement
probe have to get before it recognized a level above background?
A 1/4 inch, an inch, a foot, 10 feet?
I wore a radium watch for years. That would bury a probe at 1/4 inch,
and was recognizable out to a couple inches.
Interestingly enough my arm hasn't fallen off yet.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup