Nuclear Medicine

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6 Terms

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technetium-99m (Tc-99m)

the most widely used radionuclide.

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Radioactivity

spontaneous decay of unstable nuclei to achieve stability, releasing radiation.

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Alpha (α)

heavy, low penetration (stopped by paper/skin).

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Beta (β)

moderate penetration (stopped by aluminum or plastic).

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Gamma (γ)

high penetration (needs lead or concrete shielding).

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Half-life (T½)

time required for half of the radioactive atoms to decay.