Uranium Definition and 153 Threads

8. In the processing of uranium, one of the steps involves converting UO2 to UF6. UO2(s) + 4HF(g) + F2 (g) --> UF6 (g) + 2H2O (l) For 7.50kg of UO2, calculate: a) The mass of hydrogen fluride required. m(UO2) = 7500g n(UO2) = 27.78mol n(UO2) = n(HF) 27.78mol = m(HF) =...

Homework Statement The Earth is about 4.5 billion years old. If 235U is 0.65% abundant today, how abundant was it when the Earth formed? Note, in this case abundancy is defined as the ratio of Uranium 235 to Uranium 238Homework Equations R=N(lambda) N=N0e^-lambda(t) Half Life = ln(2)/lambda...

Is the reason why the energy liberating fustion process ends with uranium(more precisely Iron) is that uranium's bindind energy per nucleon begins to decrease and hence will absorb energy rather than emit it, and thus is not self sustaining? Thanks in Advance

If elements like uranium and thorium in fact did form the same way helium and carbon-iron do, which is through fusion. would we be able to know? Is there a way to tell if those elements are forming through fusion in the cores of stars? Like would it be possible to analyze the light coming from...

And if we increased the size of our imaginary planet, how massive and large could it get before it undergoes fusion? Also, I'm pretty sure you could never actually get a Uranium planet, but is there enough to have Uranium asteroids in a star system, or at least asteroids that are radioactive...

As I understand it, a uranium atom should exist in a superposition of its three isotopes (U238,U235,U234). Is this correct? If so, the probability of any isotope being observed should be related to its natural abundance. But this would mean that the probabilities are time dependent, which is...

1. Homework Statement [/b] A high energy beam of neutrons of intensity 10^6 s^-1 transverses a target of 238 U of thin foil whose density per unit area is 10^-1 kg m^-2. If the elastic and in elastic cross-sections are 1.4 and 2.0 b, respectively, calculate(a) the attenuation of the beam(b) the...

Homework Statement A high energy beam of neutrons of intensity 10^6 s^-1 transverses a target of 238 U of thin foil whose density per unit area is 10^-1 kg m^-2. If the elastic and in elastic cross-sections are 1.4 and 2.0 b, respectively, calculate(a) the attenuation of the beam(b) the rate of...

1. Homework Statement The relative abundance of uranium isotopes in today’s Earth crustal material is: 99.2745% 238U 0.7196% 235U 0.0055% 234U What were the relative abundances when the Earth was formed 4.6x109 years ago? 2. Homework Equations t = age = 1/lambda * ln(N/No) N...

Homework Statement The relative abundance of uranium isotopes in today’s Earth crustal material is: 99.2745% 238U 0.7196% 235U 0.0055% 234U What were the relative abundances when the Earth was formed 4.6x109 years ago? Homework Equations t = age = 1/lambda * ln(N/No) N =...

http://www.nytimes.com/2009/02/20/world/middleeast/20nuke.html My understanding is, that the point of IAEA inspections is to verify inventory, and that underreporting of production is a way of diverting material to weapons production. Of course, that doesn't make much sense here, because this...

Homework Statement a mass of 3.33x10^-28kg of uranium is converted into energy during nuclear fission (exploding) according to einstien's formula E=mc^2 where energy is measured in joules (J), m is measured in kg and c = 3000000000m/s is the speed of light Homework Equations show...

Homework Statement What proportion of the total energy in Uranium-235 is extracted through nuclear fission? In 2001, the world electricity consumption was 13.81 trillion kWh. Assuming 50% efficiency in converting and distributing the power, and imagining that all production was nuclear...

One ton of Uranium used at a typical 1 GW reactor is equal to how many tons of coal being burned in a 1 GW coal fired plant?

Homework Statement At the other end of the nuclear size spectrum are the extremely large nuclei. Examine the reaction in which uranium fractures into cerium and zirconium: 235U -> 140Ce + 94Zr + neutron. Is this reaction allowed by energy considerations? If so, how much energy is...

im so desperate. i can not find anything on the costs of uranium 234 and plutonium 239 per kilogram. please help me. also if anyone has any information on the detonation/trigger/aftermath on the bombs 'little boy' of hiroshima and 'fat man' of nagasaki. any help is MUCHLEY APPRECIATED.

pros and cons of using uranium 235 or plutonium 239 in an atomic bomb?

I understand that uranium is typically fabricated into uranium dioxide pellets when used in nuclear fuel rods; however, I can't seem to find what form it is put into when used in a nuclear bomb. I am guessing either UO_2 or uranium metal?

Homework Statement At the present time natual uranium found on Earth consists of 99.3% uranium 238 and 0.7% uranium 235. The measured half lives of these isotopes is 6.5ee9 years and 1.0ee9 years respectvely. By assuming they were equally abundent at time of formation, estimate the age of...

Does anybody know why thorium is better than uranium as far as heat transfer is concerned?

i've always wondered how the split the uranium atom to creat a chain reaction in a nuclear bomb

I can't seem to find a value for Uranium enriched to the 5% level. Does anyone know it or know where I can find it? THanks!

There is a bit of data and literature that shows the standard heats of formation for various uranium compounds including UO3, U3O8 UF6 etc. However there appears to be nothing on ammonium diuranate which is one of the most common intermediate forms produced by precipitation. The ADU as it is...

And are most of the uranium supplies outside the US? thanks

Homework Statement I have solved the equation for the neutron density as a function of position and time. I need the boundary conditions to change my infinite number of solutions (the varying separation constant) into one value so that my answer for the critical radius does not contain a...

Do supernova explosions produce lumps of uranium or atoms of uranium?

From what I hear Uranium miners are constantly under threat from radiation gas which is released from Uranium mines. What I learned before is that there are 3 types of radiation. Alpha (helium), Beta (electrons), and gamma (photons). What kind of radiation releases radon gas. If its not...

Hey there , 1-I wonder why PU-239 is basically used in nuclear destructive weapons, while U-33, U-35,U-38 (with Energy more than 1 Mev) are fissionable materials as well??! _ The Prince .

Hey there , It's known that metalic U was uesed as a fuel in certain types of reactors. What I 'd like to know : 1-Which type of reactor use metalic Uranium ? 2-Is Uranium metal used nowdays as a fuel? 3-what are the disadvantages of using U as a metal beside reacting highly with water ?

Apparently efforts to recover U from seawater were abandoned in the 1970s when studies concluded that it would cost about $1400 / lb. At the time, the spot price of U was about $40/lb. If the cost of recovering U from sea water can be brought down to $100 a pound, (current price is around $62...

So one of the big advantages to using depleted uranium (DU) rather than tungsten in anti-tank rounds is because a DU projectile will self sharpen upon impact whereas a tungsten projectile will flatten or "pancake". http://deploymentlink.osd.mil/du_library/how.shtml What is it about DU that...

this seems like a fairly simple problem, however I'm not sure if my calculation seems right... the question: The nucleus of a uranium atom has a diameter of 1.5 * 10 to the -14 and a mass of 4.0 * 10 to the -25. It then asks what the density of the nucleus is. I know that nucleus...

Hi all, I am trying to study fission, and my crude understanding has some gaps. a) U235 fissions when it absorbs a thermal neutron because U236 is energetically favorable, and the energy difference is larger than the activation barrier to splitting. The activation barrier in the simple...

free neutrons are unstable: would a muon in say uranium be "stable"? free neutrons are unstable: would a muon in say uranium be "stable"? free neutrons decompose and have a half-life of about 15 minutes. neutrons bound in a nucleus, especially in a magic shell configuration like helium-4 or...

Where i live in the UK all the A-level students have just had their results. It has been said on the news that a new A* level will be added to the A levels to differentiate between the bright and the very bright and that an example of an A* question would be: 8 million uranium atoms in...

Hi, in my environmental chem class at school, we vaguely touched on the subject of nuclear power and such. my question has to do with the splitting of the U235 or 238 atoms in reactors, as well as those in, say, nuclear weapons. my teacher (and diagrams) said that the splitting occurs when the...

I'm seriously lost! Here's the problem: It has been estimated that the Earth contains 1.0 x10^9 tons of natural uranium that can be mined economically. If all the world's energy needs (7.0 x10^12 J/s) were supplied by 235(U) fission, how long would this supply last? Assume that the average...

Would i be right in saying that if a radioactive material (e.g. Uranium) is placed into sealed box then it would not radiate? i came to this conclusion through the Heisenburg uncertainty principle. If the particles making up the uranium are not measured then they don't decide on a quantum state...

Natural Uranium found in the Earth's crust contains the isotopes A=235 and A=238 in the atom ratio of 7.3*10^-3 to 1. Assuming that the time of formation of the Earth these two isotopes were formed equally, and that the mean lives are 1.03*10^9 years and 6.49*10^9 years respectively, show that...

http://news.bbc.co.uk/1/hi/world/europe/4402594.stm Bush was told it was a fake story but ran with it anyway...

Uranium Tiles and tobacco plant growth Someone told me a few years back that tobacco industries have used uranium tiles to help grow tobacco plants. I wasn't sure about this so I decided to throw the topic at my biology professor in case he knew something I didn't. I don't know if this is...

Hi, I have a couple of more questions for all the kind and learned people here. Are there any (approx) benchmarks for quantifying how much uranium ore (kg) is going to be rquired in order to generate a given amount of electricity over a specific length of time? Let me clarify...

I just read that Iran is resuming their uranium conversion. http://www.cnn.com/2005/WORLD/meast/08/08/iran.nuclear/index.html Since this is not uranium enrichment, it's no big deal, right? Do you suppose United States and/or other countries go crying to the UN?

Has anyone run across this site before? I found it long ago, but I am not sure why I found it and I just bumped into it again. http://www.unitednuclear.com/uranium.htm It is selling uranium ore from ten thousand counts per minute up to five hundred thousand counts per minute. I calculated...

interesting piece about depleted uranium; http://www.iconoclast-texas.com/News//19news02.htm

Here I have a problem: A 232/92 Uranium nucleus emits an alpha particle with kinetic energy=5.32MeV. What is the final nucleus and what is the approximate mass(in units) of the final atom. I can write the equation for the reaction, this will give 4/2 He and 228/90 Th. If the alpha particle...

http://www.barremore.net/depleted-uranium-kills.html i would like to know the legitimacy behind these claims if anyone can confirm im honestly a bit scared Adam

The more I learn about this stuff the worse it seems can it really be called a weapon of mass destruction should the 'coalition' in iraq be prosecuted for war crimes. Biased information but it gets the point across. http://english.aljazeera.net/NR/exeres/B2E2DF9B-1E0C-43F4-BBF6-074C1367E27C.htm

i heard that in the war between iraq and america the american soldiers used uranium bullets. why is that ? is it because its very dense ?

if the army make rounds with depleted uranium, wouldt the radioactivity emmited be enough to cause cancer after a while?