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Is uranium nuclear fuel?
Yes, U233, U235, and U238 are all used as nuclear fuels.
Why couldn't the fish fossil or dinosaur skull be dated with either c14 or u238?
Fish fossils and dinosaur skulls cannot be dated using carbon-14 (C-14) because they are typically millions of years old, far exceeding the C-14 dating range of up to about 50,000 years. Additionally, uranium-238 (U-238) dating is generally used for much older geological formations and requires specific conditions that may not be present in all fossil contexts. These fossils often lack the necessary materials or context for accurate U-238 dating, making radiometric methods unsuitable. Instead, other dating techniques, such as relative dating or stratigraphy, are often employed for these ancient specimens.
What is meant by reactor grade materials?
This means that the nuclear material is of a high enough concentration to fissile (allow for a fission chain reaction). This is because Uranium comes naturally as 99.3% U238, which cannot sustain fission, and .7% U235, which is what they want for the fuel. So they have to find away to pull away the U238 and leave the U235. As they concentrate the U235, it becomes concentrated enough so that it can sustain fission (too much U238 bogs down the reaction and will eventually end the fission). When it reaches this point of concentration, it is concidered reactor grade. Different elements have different needed concentrations to reach this level.
What number is written after the isotope when writing the name?
The atomic mass number of that isotope. So C14 has a molecular mass of 14 grams/mole U238, 238 grams/mole
How is the structure of an atom of uranium -235 different from the structure of an astom of uranium -238?
The main difference between the two isotopes is their atomic mass. Uranium-235 has 235 nucleons (protons and neutrons) in its nucleus, while uranium-238 has 238 nucleons. This difference in atomic mass results in distinct properties, such as their stability and nuclear reactions.
What is fisssion track dating?
It is a dating method in geology based on natural fission of U238 to determine the atomic displacement (tracks) counts to determine age of material or volcanic deposits.
What keeps the rocks inside the earth in molten state?
Radioactive decay in the inner core of k40 U238 and Th232 cause the earths internal heat plus lithostatic pressure (pressure of the overlying rocks).
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
Is uranium nuclear fuel?
Yes, U233, U235, and U238 are all used as nuclear fuels.
Which method dating would you use with frozen fossils?
Among many methods, carbon dating is most commonly used to date fossils. In carbon dating, scientists look at how much carbon is left in the fossil, look at the half-life period, and use that to see when it was from.
Is half life the same for each isotope?
No, the half-life of each isotope can vary significantly. Different isotopes have different rates at which they decay into other elements. Some isotopes have half-lives of seconds, while others have half-lives of millions of years.
Why couldn't the fish fossil or dinosaur skull be dated with either c14 or u238?
Fish fossils and dinosaur skulls cannot be dated using carbon-14 (C-14) because they are typically millions of years old, far exceeding the C-14 dating range of up to about 50,000 years. Additionally, uranium-238 (U-238) dating is generally used for much older geological formations and requires specific conditions that may not be present in all fossil contexts. These fossils often lack the necessary materials or context for accurate U-238 dating, making radiometric methods unsuitable. Instead, other dating techniques, such as relative dating or stratigraphy, are often employed for these ancient specimens.
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
What is nuclear breeding?
This means the breeding of fissile material from non-fissile. Thus for example Pu239 results from irradiating U238 which is not fissile. Thorium can also be used to breed fissile uranium.
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.
What is one of the daughter elements of urainium-238?
U238 is a stable isotope of uranium - it doesn't undergo decay except at a very very slow rate unless hit with Neutrons - then it will decay to Neptunium
What are the relative amounts of U-238 and U-235 found in fuel rods?
It depends on the type of reactor you're using. For light-water reactors, the most common type of reactor, the ratio of U235/U238 is usually around 3.5%.
