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2010-01-05 22:32:25
2010-01-05 22:32:25

Uranium 235 halflife: 7,038.108 years

Uranium 238 halflife: 4,468.109 years

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Uranium 235 has a half-life of 700 million years.


The half-life of uranium-235 is 703 800 000 years.


Uranium 235 half life is: 7,038.108 years.


The half-life of uranium-238 is about 4.47 billion years and that of uranium-235 is 704 million years.


If you think to uranium 235 the half life is 703 800 000 years.


It takes approximately 700 million years for uranium 235 to decay to half of its original form.



== == Naturally occurring uranium is a mixture of three isotopes. The most abundant (greater than 99%) and most stable is uranium-238 (half-life 4.5 x 109 years); also present are uranium-235 (half-life 7 x 108 years) and uranium-234 (half-life 2.5 x 105 years). Different isotopes have different half-lives. The most stable isotope of uranium, 238U, has a half-life of about 4.5 billion years.


The half-life (time necessary for the disintegration of 50 % uranium atoms in lead stable isotopes) for uranium: Uranium 235: 7,038.108 years Uranium 238: 4,468.109 years


Uranium 235, with a half-life of 700 million years1, will decay to 0.95x10-6 of its original value after 14 billion years, and to 0.25 of its original value after 1400 million years. AT = A0 2(-T/H) --------------------------------------------------------------------------------------------- 1The actual half-life of 235U92 is 704 million years. The answer given used 700, not 704.



Uranium 235 has a half life of about 7000 million years if 1 kg of U235 is put on a shelf in a laboratory and left for 700 million years 900 g would remain. The bigger question would be how the shelf and laboratory survived that long.


Uranium is a radioactive element and conteneously disintegrate into smaller element, that time in which 1g of uranium becomes half g is known as half life period of uranium.


Uranium 234, 235 an 238 are all natural isotopes of uranium.Uranium 235- neutrons: 143- atomic mass: 235,043 929 918 ± 0,000 001 957- half life: 7,038.108 years- concentration in natural uranium: 0,7204 %- 235U is a fissile isotope


In nature, uranium is found as uranium-238 (99.2742%), uranium-235 (0.7204%), and a very small amount of uranium-234 (0.0054%). Uranium decays slowly by emitting an alpha particle. The half-life of uranium-238 is about 4.47 billion years and that of uranium-235 is 704 million years,[4] making them useful in dating the age of the Earth.


If a rock sample is determined to have one-quarter of the uranium-235 content it had when it formed the age of the rock sample is 1.426 billion years.


Uranium 235- neutrons: 143- atomic mass: 235,043 929 918 ± 0,000 001 957- half life: 7,038.108 years- concentration in natural uranium: 0,7204 %- 235U is a fissile isotopeUranium 238- neutrons: 146- atomic mass: 238,050 788 247 ± 0,000 002 044- half life: 4,468.109 years- concentration in natural uranium: 99,2742 %- 238U is a fertile isotope


Nagasaki would be contaminated for about 703.8 Million years as that is the half life for Uranium 235. Hiroshima would be contaminated for 24,100 years as that is the half life for Plutonium 239.


A half life pertains to the time it takes for exactly half of a substance to disappear. So, if U235 has a half life of 700 million years, it will take 700 million years for half of it to decay. That would leave .5kg or 500g.


Uranium 235 will naturally decay (with a half-life of 700 million years) into thorium 231. If it encounters a neutron, it can split into 2 or 3 smaller atoms; the exact atoms formed may vary.Uranium 235 will naturally decay (with a half-life of 700 million years) into thorium 231. If it encounters a neutron, it can split into 2 or 3 smaller atoms; the exact atoms formed may vary.Uranium 235 will naturally decay (with a half-life of 700 million years) into thorium 231. If it encounters a neutron, it can split into 2 or 3 smaller atoms; the exact atoms formed may vary.Uranium 235 will naturally decay (with a half-life of 700 million years) into thorium 231. If it encounters a neutron, it can split into 2 or 3 smaller atoms; the exact atoms formed may vary.


The time depends on the isotope. The half life of uranium-238 is about 4.47 billion years and that of uranium-235 is 704 million years. The half life is the amount of time during which any given atom of the isotope has a 50% chance of undergoing decay. Seen another way, the half life is the time it takes for half the atoms of an isotope in a mass of that isotope to undergo decay.


This time is 351 900 000 years.The exact value of the half-life is 703,8 millions years.


CANDU reactors works now with natural uranium.Uranium 235- neutrons: 143- atomic mass: 235,043 929 918 ± 0,000 001 957- half life: 7,038.108 years- concentration in natural uranium: 0,7204 %- 235U is a fissile isotopeUranium 238- neutrons: 146- atomic mass: 238,050 788 247 ± 0,000 002 044- half life: 4,468.109 years- concentration in natural uranium: 99,2742 %- 238U is a fertile isotopeUranium 234not important


Uranium-235 is an isotope of uranium making up about 0.72% of natural uranium.


Uranium has 29 natural and artificial isotopes. Each isotope has his specific half life; for the natural isotopes the half lifes are: U 234: approx. 2.45 x 105 years U 235: approx. 7.04 x 108 years U 238: approx. 4.46 x 109 years



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