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PET works by using a scanning device (a machine with a large hole at its center) to detect photons (subatomic particles) emitted by a radionuclide in the organ or tissue being examined.
Newer technology combines PET and CT into one scanner, known as PET/CT. PET/CT shows particular promise in the diagnosis and treatment of lung cancer, evaluating epilepsy, Alzheimer's disease and coronary artery disease.
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Answer:
Long term condition of the atmosphere
Explanation:
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The various atomic masses of the same element are called<u> isotopes</u>. They have the same number of protons but different number of neutrons.