[time-nuts] Thermal time constant
jimlux
jimlux at earthlink.net
Thu Mar 11 14:00:36 UTC 2010
Predrag Dukic wrote:
>
>
> How well depleted it really is?
DU has about 1/3 the U235 of natural U, of which less than 1% is U235.
All the isotopes are radioactive, but I don't recall what the relative
activities are. I think U238 has a half live of 4E9 years or more, so
not very many atoms spontaneously disintegrate every second.
Uranium separation is not perfect. Some
> radioactivity is still left.
Not much.. you'd have more trouble if you lived on granite or lived in a
brick/stone house.
It's an alpha emitter, too, so painting it would provide shielding.
It's the fact that it's a heavy metal that's more of an issue for toxicity.
Don't know about the neutrons from the spontaneous fission.
>
> I don't think it is healthy to have it beside You for a long time.
>
> Certainly not 80000 pounds :))
>
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>
>
> At 05:35 11.3.2010, you wrote:
>> Bob Camp wrote:
>>> Hi
>>> The gotcha is that you are interested in the amount of heat per cubic
>>> foot rather than the amount of heat per pound. You need to take the
>>> standard heat per weight numbers and convert them to heat per volume
>>> numbers.
>>> Of the things you can easily get, copper is good. Steel is not as
>>> good as copper, but better than aluminum.
>>> Bob
>>
>> Gold is your friend. Mercury has convective losses because it's a
>> liquid. Platinum or Osmium would also be ok.
>>
>> You might want something that is dense but lower conductivity.. lead?
>> Depleted Uranium? (DU is available very cheaply if you can take 80,000
>> pound lots)
>>
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>
>
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