Absolute and relative dating ppt


28-Feb-2016 23:54

The army people said, "No, it is our policy to keep all the information of Los Alamos at one place." The people in Oak Ridge didn't know any thing about what it was to be used for (; they just knew what they were trying to do. A second recent case of knowledge rendered useless without recognizing the presence of a fatal uncertainty involved the loss of the Mars Climate Orbiter on September 23, 1999. The contractor had used English units, and the probe burned up in the Martian atmosphere Sept.

(You have to purify it in several stages.) So they were practicing on the one hand, and they were just getting a little bit of U235 from one of the pieces of apparatus experimentally on the other hand.

And they were trying to learn how to assay it, to determine how much uranium 235 there is in it. Now they are all upset." It turned out that the army had realized how much stuff we needed to make a bomb -- twenty kilograms or whatever it was -- and they realized that this much material, purified, would never be in the plant, so there was no danger.

They were beginning to get infinitesimal amounts from an experimental thing [isotope separation] of 235, and at the same time they were practicing the chemistry.

There was going to be a big plant, they were going to have vats of the stuff, and then they were going to take the purified stuff and repurify and get it ready for the next stage.

One thing had to do with the safety of the plant at Oak Ridge, Tennessee.

Los Alamos was going to make the [atomic] bomb, but at Oak Ridge they were trying to separate the isotopes of uranium -- uranium 238 and uranium 235, the explosive one.



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