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2 different isotopes of uranium.
isotope= element with same number of electrons, same number of protons, different numbers of neutrons.
U235 has 143 neutrons and 92 protons
U238 has 146 neurtons and 92 protons
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∙ 12y ago
Wiki User
∙ 13y agoans2. Several of the radio decay products of Uranium are used, including an U-U system in which several decay steps involve several elements.
In general, 235U decays to 234U with a half life of 4.5x109 years. This then decays to 234Th and so on. Some of these half life decay steps are more appropriate to use than others.
Answering the Q closely, 235U dating is using the natural radiometric decay process as a measure of time. And thus the age of the material.
Wiki User
∙ 14y agoUranium 235 is a natural isotope of uranium; some characteristics: Atomic Mass: 235,043 929 918 ± 0,000 001 957 amu Protons and electrons: 92 (atomic number) Neutrons: 143 Halflife: 7,038.108 years Concentratiom in natural uranium: 0,711 % Uranium 235 is easily fissionable with thermal neutrons and is very important in nuclear fuels.
Wiki User
∙ 15y agoU235 is Uranium-235, a less common isotope of uranium. The most common isotope of uranium is Uranium-238, or U-238.
Wiki User
∙ 13y agoUranium is the fuel that fuels nuclear reactors.
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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.
What do you called in an element having the same atomic number but different atomic masses?
Isotopes. eg U235 and U238. Both Uranium, atomic number 92, bur different isotopes.
How much coal gives same energy as 1kg of uranium fuel pellets?
I have a figure but this is for 1 kg of Uranium 235, normally reactor fuel is about 4 percent of this isotope, so the amount of coal would be divided by 25 if we are talking about uranium as used in PWR or BWR reactors. Also this figure is for complete use of the U235, whereas for practical reasons of maintaining reactor performance, fuel is unloaded and replaced before it is all used up. So bearing in mind the above, 1 kg of U235 will produce as much energy as 1500 tons of coal. Let's try: 1kg of U235 (3,75%) has 83,14 TJ/kg. 1J=1Ws (3600Ws=1Wh). 1TJ=1000GJ=1 mio MJ 1kg of coal has 6000Wh/kg. I get 3850tons.
How much U235 is needed for a nuclear bomb?
U-235 18.4Kg (a sphere 12.6cm diameter) will do, probably less.P-239 6.4Kg (a sphere 9.2cm diameter) will do, probably less.Nucleonics Fundamentals, McGraw Hill 1959, page 313
How many pounds of coal do you have to burn to equal the potential energy of one pellet of uranium?
# I'm not clear what size pellet you mean. However for Uranium235 (the fissile isotope), if it is fully used up, 1 kg will give as much energy as 1500 tonnes of coal, ie 1,500,000 kg of coal, so that is the ratio, 1,500,000 to 1. Of course uranium as loaded into the reactor is actually about 4 percent U235, the rest U238 which is not fissile, so the U235 is 1/25 of the total weight of uranium, and if you mean the total uranium weight you therefore have to reduce this ratio by 25, and get 60,000 to 1.
What is being done to reverse nuclear power?
You can't reassemble the U235 nucleus after it has fissioned, so you can't put nuclear power into reverse.
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.
How many neutrons are in Element 92?
Element number 92 is Uranium and there are two main isotopes - U235 and U238. In U235 there are 92 protons so there are 235 - 92 = 143 neutrons. In U238 there are thus 146 neutrons
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 difference between using uranium for power or bombs?
In power reactors the fuel is uranium enriched slightly to about 4 percent U235 (the fissile isotope), whereas for a bomb you need the U235 as high as possible, in the high 90's I believe.
What isotopes are in this process?
which process & which isotope u mention 1. nuclear reaction U235 & Pu239
Is uranium nuclear fuel?
Yes, U233, U235, and U238 are all used as nuclear fuels.
What are in nuclear bombs?
Enough of either U235 or PU239 to form a critical mass and hence a large explosion
What is fuel enrichment - nuclear?
Natural uranium contains approx 0.7 percent U235, the rest U238. The 235 is the useful fissile isotope. Some reactors using graphite or heavy water can use natural uranium, but light water reactors need to have the U235 proportion increased to about 4 percent. this is called enrichment.
Is uranium 235 a state in which matter flows as it takes the shape of a container?
The question is asking if U235 a liquid or a gas. It is a solid and does not flow.
Why is large mass of uranium-235 needed for a chain reaction?
Each time a U235 atom decays, it emits 2-3 neutrons. The likelihood that one of these neutrons is captured by another U235 atom INCREASES with more mass. The SHAPE of this mass will also play a role, imagine a thin wire of U235, compared to a sphere, with regards to how likely a chain reaction will occur. Neutron reflection can also help redirect an errant neutron back into the mass so it can react instead. Compression (increase of density) plays a role as well.
How are isotopes of the same element named?
The same name with a different atomic mass number. As an example U235 and U238 are two isotopes of Uranium
