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How are hash marks useful in marking raceways?
Substance
material with particular physical characteristics, an important concept in chemistry and physics.
Nuclear Medicine
A medical specialty involving the application of radioactive substances in the diagnosis and treatment of diseases.
Radiopaque Substance
A substance that does not allow X-rays to pass through and appears white or light on an X-ray film, used in medical imaging to highlight structures.
Radioactive Isotope
An isotope that exhibits radioactive decay, emitting radiation in the process.
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