Medical Uses of Nuclear Radiation and Pet
Nuclear radiation and radioactive tracers can be used in medicine for diagnosis, imaging and treatment under controlled professional conditi
Definition
Nuclear radiation and radioactive tracers can be used in medicine for diagnosis, imaging and treatment under controlled professional conditions. A PET scan is an imaging technique that detects photons associated with positron-emitting radioactive tracers inside the body.
Diagnostic Tracers
Radioisotopes can be useful because their radiation can be detected externally. A suitable radioactive tracer can be introduced under medical supervision. Its distribution can provide information about physiological processes.
Treatment
Ionizing radiation can also be used clinically to damage targeted abnormal tissue, with treatment planned to limit exposure to healthy tissue.
PET — Positron Emission Tomography
A PET tracer contains a positron-emitting radionuclide. After positron emission, the positron eventually encounters an electron. Annihilation can produce two gamma photons traveling in approximately opposite directions. A ring of detectors identifies coincident photons. Computer processing reconstructs information about tracer distribution.
Safety Principle
Medical use of ionizing radiation requires professional dose control, justification and radiation-protection procedures.
Formula / Key Relation
For electron-positron annihilation approximately at rest: **e⁺ + e⁻ → 2γ Each photon: ≈0.511MeV**
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Medical Uses of Nuclear Radiation and Pet
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PET:
- Tracer
- Positron emission
- Annihilation
- 2 gamma photons
- Detectors
- Computer reconstruction
60-second revision
- Radioisotopes provide detectable signals for medical diagnosis, imaging and treatment.
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