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5.6 Nuclear Fission and Fusion -- Part 1
Gallium-68 is taken up by tumors and the emission of positrons allows them to be located.
Scientists discovered in the 1930s that the U-235 nucleus splits into two smaller nuclei and produces a lot of energy.
If we could determine the mass of the products with great accuracy, we would find that their total mass is slightly less than the starting materials.
The result is a large value for the energy released when the mass loss is taken into account.
The nucleus of a uranium atom is hit by a neutron.
The nucleus is unstable and splits into smaller pieces.
There is a critical mass of rapid increase in the number of high-energy neutrons.
In a nuclear chain reaction, a single atom of uranium-235 produces three neutrons, which in turn cause more and more of the same atom to be created.
Mass is lost and a lot of energy is released.
A fusion reaction requires a temperature of 100 000 000 degC to overcome the repulsion of the hydrogen nuclei.
The Sun and other stars provide us with heat and light.
The amount of energy produced by the sun comes from the fusion of hydrogen.
In a fusion reaction, large amounts of energy are created by the fusion of hydrogen and helium.
Nuclear chemistry scientists expect fusion to have shorter half-lives.
Due to the high temperatures needed, fusion is still in the experimental stage.
The fusion reaction for energy is a technology that is being developed by research groups around the world.
High temperatures are needed to combine hydrogen atoms.
A large nucleus breaks apart.
A lot of energy is released.
It is necessary for high temperatures to be used for reaction.
The process of fission occurs when a large nucleus breaks apart.
The fusion and fission processes produce large amounts of energy.
fusion requires a high temperature.
The process of fusion is when small nuclei combine to release energy.
There is a nucleus.
It is necessary to start the reaction at very high temperatures.
The Sun has a nuclear process.
Less radioactive waste is produced.
The reactants are hydrogen nuclei.
Small nuclei are combined to form larger ones.
Nuclear reactions release large amounts of energy.
Nuclear power plants help meet some of our energy needs, but they cannot sustain a chain reaction.
Nuclear power has some problems associated with it.
One of the slower things to do is to place control rods, which absorb some of the most serious problems.
There is a slower, controlled production of energy in this way.
It is important that the waste products are stored in a way that is safe.
The steam drives a generator in a place where they don't harm the environment.
Nuclear power plants generate 20% of the electrical energy produced in the United States.
The United States gets 20% of its electricity from nuclear power plants.
Nuclear heat is used to generate electricity.
When she reaches the maximum level, she is injected with a radioactive dye again.
There is a second set with images of her heart activity.
The muscles at rest are taken.
A thallium stress test can show the heart, as it can show how effectively coronary arteries provide blood to normal blood flow.
If Simone has any damage to her arteries or heart muscle during stress.
If the half-life of Tl-301 is 3.0 days, what is its activity in 24 mGy.
Radioactive isotopes have unstable nuclei that break down.
Shielding, limiting the time of exposure, and measuring the activity are some of the things that must be done.
The sievert and rem are used to determine Write a Radiation biological damage from different types of radiation.
The type of radiation emitted can be half-lives.
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