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The concentration of U235 in the atomic bomb?
The references I have state Oralloy is 93.5% U235. Oralloy (Oak Ridge Alloy) was used in US Uranium atomic bombs as the fissile material. However they also say that any enrichment 20% U235 or higher is fissile and could be used to make a bomb, it would require a higher critical mass to work though. One source I have states that early Soviet Uranium atomic bombs used ~97% U235, but the US felt this level of enrichment to be unnecessary and excessively expensive.
The splitting of a heavy nucleus is called?
nuclear fission
What term is use to describe splitting a large atomic nucleus into smaller ones?
Nuclear fission is defined as splitting large nuclei into smaller ones.
Does Uranium 238 and 235 release neutrons in nature as they do in a fission process?
Yes, by spontaneous fission, but the nymber of neutrons is very small because the halflife of the spontenuoes fission is: for Uranium 235: (1,0 ± 0,3).1019 years for Uranium 238: (8,20 ± 0,10).1015years
What kind of nuclear reaction does an atomic bomb use?
Fission bombs use fission. Fusion bombs use fusion. Although atomic bomb is usually used for fission bombs, it technically applies equally to either.
Where does the nuclear enengy come from?
It comes from the fission of certain nuclei, mostly U235 and Pu239. Every fission of a nucleus of an atom of these materials releases a certain amount of energy as heat.
What is meant by reactor grade materials?
This means that the nuclear material is of a high enough concentration to fissile (allow for a fission chain reaction). This is because Uranium comes naturally as 99.3% U238, which cannot sustain fission, and .7% U235, which is what they want for the fuel. So they have to find away to pull away the U238 and leave the U235. As they concentrate the U235, it becomes concentrated enough so that it can sustain fission (too much U238 bogs down the reaction and will eventually end the fission). When it reaches this point of concentration, it is concidered reactor grade. Different elements have different needed concentrations to reach this level.
What is oralloy?
Oralloy is an acronym for "Oak Ridge Alloy". Which is an alloy of Uranium 235 and Uranium 238. The U235 is the fissile isotope that is used in fission type nuclear weapons. The actual concentration is classified, but generally U235 is greater than 90%.
What is the best way at producing electricity?
in order,- Fission, (u235) Fusion, (d-t) Fusion (sun) Antimatter, Zero point energy.
Is the uranium-235 isotope the most commonly used fuel in fission power plants?
Yes U235 is the fissionable isotope of Uranium. Natural Uranium contains only about 0.7 percent U235, which is enough to produce fission only with a good moderator such as graphite or heavy water. In light water reactors the Uranium has to be enriched to about 4 percent U 235.
The atoms that remain after a nucleus disintegrates is?
smaller then the original atom and possibly radioative
In a reactor what is nuclear energy produced in?
It is produced in the fuel rods by fission of the U235 nuclei. Each fission produces a certain amount of heat, and this is transferred to the water or gas which is pumped past the fuel, by contact heat transfer.
One valuable characteristic of fission is the amount of energy released foe each disintegrating atom is?
Each fission of U235 releases 200 Mev (200 million electron volts) which in terms of Joules is 3.2 x 10-11 Joules
What causes fission?
Only certain elements are fissionable, or at least with practical means. The fission of for example the atom U235 happens when it is struck by a slow neutron, it splits, which is fission, releasing two smaller atoms and two or three neutrons (products). The products from the nuclear reaction weigh less then the original atoms. The difference in weight is converted into energy.
What do you use to split a uranium nucleus in nuclear fission?
Fast neutrons fro U238 but you can use slower neutrons for U235. Other fast bombardment nucleii may also be used
What are the example of nuclear fission?
The only example of nuclear fission in a naturally occurring material is of Uranium 235, which comprises 0.7 percent of natural uranium, the rest being Uranium 238 which is not fissile. To use U235 in a nuclear reactor it is usually enriched to about 4 percent first, though reactors have been designed to use natural uranium. These have to use graphite or heavy water as moderator, as normal water absorbs too many neutrons. During reactor operation some of the U238 absorbs a neutron and becomes Plutonium 239 which is also fissile, so this contributes to a proportion of the reactor power which increases as the fuel is used and the U235 diminishes.
Fission is the process of creating energy by?
On nuclear fission, small fraction of mass is loss and transform to energy. The loss mass is part of tiny sub-atomic particle. Consider reaction of Uranium U235 + n1 --> U236 --> Kr92 + Ba141+3n1 Well seem all mass is balance. But take careful step U235 is 235.0439 U236 is 236.0526 Kr92 is 91.92616 Ba141 is 140.9144 n is 1.008665 Some mass was lost and that mass go to energy as Einstein state E = mC2
