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If the half-life of uranium 235 is 700 million years and have 64 atoms of it how many 700-million-year units of time will pass before 1 atom of uranium 235 is left?
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What element is used to make nuclear weapons?
Uranium-235Uranium-233Plutonium-239DeuteriumTritiumAs tritium is radioactive with a short halflife (12 years), weapons using it age rapidly possibly becoming unreliable. Therefore it is normally produced from Lithium (in the form of Lithium Deuteride) by fission neutron bombardment just before fusion is initiated.
Why is it necessary to enrich the uranium before manufacturing the fuel pellets?
Natural uranium is only 0.72% fissile uranium-235 isotope. This is only fissionable when using heavy water as the moderator to slow the fission neutrons. With any other moderator you need 3% to 5% uranium-235 isotope. For unmoderated fast neutron reactors like breeders you need 20% to 95% uranium-235 isotope.
What was the function of graphite in the first atomic reaction?
moderator, it slowed fast neutrons to thermal velocities so that they would be less likely to be captured by uranium-238 before they could fission uranium-235.
What was uranium used for before the atom bomb?
Colouring glass and ceramics, also for furnitures, mordant for textiles, photographic reagent
What do scientists have to do with the uranium before using in a nuclear bomb?
To use natural uranium in a bomb either of 2 things must be done first, both are expensive and require large infrastructure investment to do them:Enrich the uranium from 0.72% uranium-235 (natural) to 93.5% uranium-235 (Oralloy or HEU).Process the uranium to turn some of the uranium-238 to plutonium-239 in a reactor then chemicallly separate the plutonium from the rest of the irradiated material chemically.In WW2 the US did step 1 at Oak Ridge, TN using a gigantic gaseous diffusion enrichment plant and an electromagnetic separation plant; and step 2 at Hanford, WA using several graphite moderated reactors and large chemical separation plants called "canyons".
What element comes before uranium and after on table?
Before uranium is protactinium. After uranium is neptunium.
What was used before uranium?
Before uranium discovery and before the 150 years long study of its properties the nuclear energy was nonexistent.
What element is used to make nuclear weapons?
Uranium-235Uranium-233Plutonium-239DeuteriumTritiumAs tritium is radioactive with a short halflife (12 years), weapons using it age rapidly possibly becoming unreliable. Therefore it is normally produced from Lithium (in the form of Lithium Deuteride) by fission neutron bombardment just before fusion is initiated.
Is uranium dangerous before it is processed?
Processed or not uranium has some disadvantages: 1. Uranium is a possible polluting agent of the natural environment. 2. Uranium is a toxic and radioactive chemical element. 3. Uranium release radium and radon.
What origin does the name uranium come from?
Uranium name is derived from the name of the planet Uranus. Uranus was discovered a few years before the discovery of Klaproth in 1789 - a mineral containing uranium.
What was uranium used for before 1920?
For colouring glasses and ceramics.
Is uranium 238 a natural element?
yes, it was formed in supernova explosions that occurred before the formation of the solar system
Was uranium formed when the earth was formed so it will never run out?
No and no. Uranium was formed before the Earth formed. Even the uranium that's IN the Earth was formed before the Earth was formed, by the process of stellar nucleosynthesis. Also, the most stable isotopes of uranium do have very long half-lives, but they are still radioactive, meaning that they eventually will decay into other materials.
Why does uranium ore have to be enriched before its used in a nuclear power plant?
1. Uranium must be refined to obtain "nuclear grade" uranium. 2. The enrichment in the isotope 235U depends on the type of the nuclear reactor; some reactors (as CANDU) work with natural uranium.
Compared to the mass of a uranium nucleus before splitting the pieces it splits into have?
The masses of fission products are of course smaller than the masses of uranium isotopes.
If you took 1 Valium 3 weeks before a drug test would it show up in your urine?
no, look at its halflife (how long until half of it is gone from ur body)
What was the population before and after the Irish Potato famine?
8 million before, about a million died, about a million emigrated.
