What is the half life of uranium?
== == 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.
How much uranium is left if a solid piece exists for one half-life?
Half life is the time taken for half the atoms to decay. Whatever mass you start with, if it is a sample consisting of one pure uranium isotope, you will have half that mass of uranium after one half life. The piece of metal will not weigh half of the original mass, because the decay products will be there. In practice, a piece of uranium usually consists of a mixture of isotopes with different half…
Is radioactive decay slow?
Radioactive decay is measured as a half life and it varies enormously. REALLY enormously! The shortest half life is for artificial elements where the half life is a few millionths of a second, the longest is hydrogen which has a half life of far longer than the lifetime of the universe! Uranium has a half life of around 4000 million years; geologists use uranium (and other elements) to calculate the age of rocks based on…
How long will 12500 tons of uranium last?
Uranium could theoreticaly last forever. The life of each uranium particle is random but over a large mass a half life can be calculated. Uranium-238(most common type of uranium) has a half life of 704 billion years so if you had 12500 tons of uranium after 704 billion years there would be 6250 tons. Every 704 billion years the mass would half until there was only an insignificant amount left.
A certain isotope of uranium has half life of 4years after 12 years how many kg of isotope will remain from original sample of 100kg?
If a radioactive isotope has a half-life of 4 years, than 0.125 (0.53) of the isotope will remain after 12 years, or 3 half-lives. The question asked about Uranium. There is no isotope of Uranium with a half-life of 4 years. The closest is 232U92, which has a half-life of 68.9 years. Reference: http://www.nndc.bnl.gov/chart/
What is the half-life of the isotope of uranium used in a CANDU reactor?
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 isotope Uranium 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 Uranium 234…
What is the half-life of radioactive material?
This depends on the type of material. Uranium-238's half-life is 4,438,000,000 years. But the half-life of a material such as Radon-218 is only 35 ms. There is a great range of half-lives for a wide variety of isotopes, so it is impossible to generalize. If you're asking what a half-life is, it is the amount of time it takes for half of any quantity of a radioactive isotope to decay. So if you had a…
Does the absolute age of a rock change?
yes, it does actually because, radiometric dating determines the half life of the uranium in the rock. They can tell how old the uranium is because, all forms of uranium starts with 4.6 billion years of life. Meaning if the half life is 2.3 billion years that means the rock is about 2.3 billion years old
What element is the great great granddaughter of U-238?
Radium 226 would be the great great granddaughter of Uranium 238. Uranium 238 decays to Thorium 234 with a half-life of 4.5 billion years. Thorium 234 decays to Protactinium 234 with a half-life of 24 days. (child) Protactinium 234 decays to Uranium 234 with a half-life of 1.2 minutes. (granddaughter) Uranium 234 decays to Thorium 230 with a half-life of 240,000 years. (great granddaughter) Thorium 230 decays to Radium 226 with a half-life of 75,000…
The half-life of a radioactive isotope is?
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.
What is the half life of the Chernobyl reactor?
there is no half-life of chernobyl reactor, becuz reactor is not substance at all, its object. you can ask whats half-life of materials used in reactor EDIT: life will be habitable there in about 22,000 years. but if the uranium was weaponized to a fraction of its potential, then it would be about 500million years. Be glad its 22,000 instead of half the Earth's age. 1.2billion years to decompose 2 "bricks" of highly ionized uranium.
How is uranium 235 and uranium 238 different?
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 Uranium 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
What is meant by the half-life of a radioactive element?
The half life of a radioactive element means that half the atoms in that element will decay in that amount of time eg Uranium 238 the most prevalent isotope in Uranium ore has a half life of 4.46 billion years, so half the atoms in any sample of this element will take this length of time to decay. The half life of something is how long it takes for half of it to disintegrate. e.g…