What is the half life of depleted uranium?
448966
Depleted Uranium, or U-238, has a half life of 4.5 billion years before decaying to Thorium.
930232
the time it takes for half of the material to decay
387120
You're close.  To find out how much uranium oxide is formed you have to determine how many moles of each starting material you have available and which is the limiting reagent.\n\nU + O2-> UO2\n\nMoles U = grams U/molecular weight = 100g/238.03g/mol\n=0.42moles uranium\n\nMoles O2 = grams O2/molecular weight = 37.2g/32g/mol\n=0.156moles O2\n\nFrom the chemical equation; 1 mole U + 1 mole O2 yeilds 1 mole UO2.  So from the above calculations we can see that the amount of O2 is limiting.  Thus the number of moles of UO2 formed must be equivalent to the #moles O2 (because it's limiting).  You can then calculate the grams of UO2:\n\ng UO2= moles UO2 formed * molecular weight UO2\ng UO2 = 0.156moles * 270.03g/mol\ng UO2 = 42.12g\n\n\nTo fully oxidize 100g of uranium, the number of moles of oxygen gas would have to be equivalent to the # of moles uranium.\n\nFrom the calculations above, we know that 100g U= 0.42 moles\n\nSo the # moles O2 required for complete oxidation is 0.42 moles.  Therefore the number of grams O2 can be calculated by using the molecular weight of O2:\n\ngrams O2= #moles O2* molecular weight O2\ngrams O2= 0.42* 32g/mol= 13.44grams O2 required
380761
Depleted uranium is a low grade radioactive metallic substance that is very dense (heavy).  Kinda like lead.  Used in sheets, its a GREAT armor.  Used in bullets and projectiles, it's deadly.\n\nThank you for your time.
206512
it depends on how long you have been taking them and the mg of the pill. the half life in your body is 3.8 hours. this means that in 3.8 hours one-half of it has metabolized out of your system, over the next 3.8 hours one-half of what is left in your system after the first 3.8 hours is gone and so on and so on until you reach zero.
208940
theres some  decay equation, i think. \nyou know that   the element   will have half the original after 40 days. so its like F = I (1/2)^d/40    i think. so d is the number of dayz and I is the initial.  so if d=40 dayz  youll have half  the original. \nanyways i might be wrong so sorry if i am but if im right, then u would put 100 for I (100%) and then put d=48 and find F.\nF = 100 (1/2)^(48/40)\nF = 100 (1/2)^1.2\nF = 43.52........   % of the original left after 48 days
451632
Uranium is a chemical element in the periodic table that has the symbol U and atomic number 92. Heavy, silvery-white, toxic, metallic, naturally radioactive, pyrophoric, and teratogenic, uranium belongs to the actinide series and its isotope 235U is used as the fuel for nuclear reactors and the explosive material for nuclear weapons. Depleted uranium is used in incendiary projectile weapons. Uranium is commonly found in very small amounts in rocks, soil, water, plants, and animals (including humans).
87922
Probably not many uses. It has a half life of 58 minutes. You can read about it at the link.
760649
10,000\n\nHalf life means that after 5,000 years, half the radiation is present. In another five thousand years years, only a quarter is left. In another 5,000 only an eighth is left, etc.
562664
Nuclear waste or any radiological material deteriorates in its radioactive properties at a set rate determined by spin of rates of the neutrons that orbit the nucelus of the specific molecule in question. This rate is know as a half life or the time it takes for half the neutrons to spin off. This can only be accelarated by forecfully adding electrons to the molecules of the material, which is another radiological procedure that requires large amounts of electricity.  A very expensive process.  Chemicals have virtualy no effect toward accelarating half rates.
212309
The half-lives will vary depending on the isotope.  Go to the library and look them up in "The Handbook of Chemistry and Physics" in the reference section.
831461
Are you trying to tie in depleted uranium?
168747
In radioactivity, it is the time taken for half of the nuclei in a given sample to decay (either by alpha or beta decay).  These vary form radioisotope to another.  For example Carbon-14 has a half life of 5700 years.  This means that if I have 1 gram of carbon-14, 5,700 years from now I will end up with 0.5grams (the rest would have become Nitrogen with beta decay).  If another 5,700 years pass I end up with 0.25g (!) and not 0g as common sense would indicate.  Each time a half life passes HALF the nuclei decay!In fact 'activity' decreases as time passes.\nAs said this time interval varies a lot.  The half life of Uranium-238 is 4,470,000,000 years, while that of thorium-230 is only 75,380 years.  Other half lives are quite short.  E.g. Iodine-131 has a half life of just 8 days and Sodium-24 has a half life of just 15 hours!
913117
Radiation poisoning is a real problem that goes right along with depleted uranium. The two Countries we are at war with are both glowing with our soldiers in them. Cancer is inevitable with our troops and the people that are exposed to the uranium. Our military personnel will have problems in the future.
628925
That is the law of hughe numbers.\nAbout the decay of individual nucleus you can predicht nothing.\nHowever about a measurable amount of isotope you can give its half life time.
821096
Because being so dense, Uranium is higly unstable. A normal atom simply shouldn't contain that many protons, neutrons, and electrons, so every once in a while, protons start popping out, which is what causes the radiation output. Over time, Uranium gradually changes into lighter and lighter elements through the loss of its electrons. This process is called radioactive decay.\n\nBTW, I don't mean to show off, but I'm only 14.
292520
The law of radioactive decay makes a prediction how the number of the not decayed nuclei of a given radioactive substance decreases in time. The red circles of this simulation symbolize 1000 atomic nuclei of a radioactive substance whose half-life period (T) amounts to 20 seconds. The diagram in the lower part of the applet represents the fraction of the not yet decayed nuclei (N/N0) at a given time t, predicted by the following law:\n\nN   =   N0 ·   2-t/T\n\nN .... number of the not decayed nuclei\nN0 ... number of the initially existing nuclei\nt .... time\nT .... half-life period\n\n\nAs soon as the applet is started with the green button, the atomic nuclei begin to "decay" (change of color from red to black). You can stop and continue the simulation by using the button "Pause / Resume". In this case a blue point for the time and the fraction of the not yet decayed nuclei is drawn into the diagram. (Note that these points often don't lie exactly on the curve!) If you want to restore the initial state, you have to click on the "Reset" button.\n\nIt is possible to give the probability that a single atomic nucleus will "survive" during a given interval. This probability amounts to 50 % for one half-life period. In an interval twice as long (2 T) the nucleus survives only with a 25 % probability (half of 50 %), in an interval of three half-life periods (3 T) only with 12,5 % (half of 25 %) and so on.\n\nYou can't, however, predict the time at which a given atomic nucleus will decay. For example, even if the probability of a decay within the next second is 99 %, it is nevertheless possible (but improbable) that the nucleus decays after millions of years.