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Describe three uses of radioactive isotopes
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Here are three common uses of radioactive isotopes, with brief descriptions and typical examples:
1. Medicine (diagnosis and therapy)
- Diagnostic: Small amounts of gamma- or positron-emitting isotopes are used as tracers to image organs and detect disease. Examples: technetium‑99m (Tc‑99m) for SPECT scans, fluorine‑18 (F‑18) in FDG for PET scans. The isotope is taken up or concentrated by specific tissues and its emitted radiation is detected to form images.
- Therapeutic: Beta- and gamma‑emitters are used to destroy diseased tissue. Examples: iodine‑131 (I‑131) for treating thyroid cancer/hyperthyroidism, yttrium‑90 (Y‑90) microspheres for liver tumors, cobalt‑60 (Co‑60) or linear accelerator sources in external beam radiotherapy.
2. Industry and manufacturing
- Radiography: Gamma sources (e.g., iridium‑192, cobalt‑60) are used like X‑rays to inspect welds, castings and structural parts for internal defects without cutting them open.
- Process control and gauging: Beta or gamma sources (e.g., strontium‑90, krypton‑85) measure thickness, density or level in production lines (paper, plastics, tanks).
- Sterilization and preservation: High‑dose gamma irradiation from cobalt‑60 sterilizes medical supplies and can be used for food irradiation to kill pathogens and extend shelf life.
- Safety devices: Americium‑241 is used in many smoke detectors.
3. Science, archaeology and environmental tracing
- Dating: Carbon‑14 (C‑14) radiocarbon dating determines ages of organic archaeological and geological samples up to ~50,000 years.
- Tracers in research: Radioisotopes (e.g., phosphorus‑32, sulfur‑35, tritium H‑3) label molecules so their movement and reactions can be followed in biochemical, physiological and ecological studies.
- Environmental studies: Radioisotopes help trace pollutant pathways, sediment movement and water flow.
Safety note: Because radioisotopes emit ionizing radiation, their use is strictly regulated and carried out with protocols to minimize exposure to people and the environment.
1. Medicine (diagnosis and therapy)
- Diagnostic: Small amounts of gamma- or positron-emitting isotopes are used as tracers to image organs and detect disease. Examples: technetium‑99m (Tc‑99m) for SPECT scans, fluorine‑18 (F‑18) in FDG for PET scans. The isotope is taken up or concentrated by specific tissues and its emitted radiation is detected to form images.
- Therapeutic: Beta- and gamma‑emitters are used to destroy diseased tissue. Examples: iodine‑131 (I‑131) for treating thyroid cancer/hyperthyroidism, yttrium‑90 (Y‑90) microspheres for liver tumors, cobalt‑60 (Co‑60) or linear accelerator sources in external beam radiotherapy.
2. Industry and manufacturing
- Radiography: Gamma sources (e.g., iridium‑192, cobalt‑60) are used like X‑rays to inspect welds, castings and structural parts for internal defects without cutting them open.
- Process control and gauging: Beta or gamma sources (e.g., strontium‑90, krypton‑85) measure thickness, density or level in production lines (paper, plastics, tanks).
- Sterilization and preservation: High‑dose gamma irradiation from cobalt‑60 sterilizes medical supplies and can be used for food irradiation to kill pathogens and extend shelf life.
- Safety devices: Americium‑241 is used in many smoke detectors.
3. Science, archaeology and environmental tracing
- Dating: Carbon‑14 (C‑14) radiocarbon dating determines ages of organic archaeological and geological samples up to ~50,000 years.
- Tracers in research: Radioisotopes (e.g., phosphorus‑32, sulfur‑35, tritium H‑3) label molecules so their movement and reactions can be followed in biochemical, physiological and ecological studies.
- Environmental studies: Radioisotopes help trace pollutant pathways, sediment movement and water flow.
Safety note: Because radioisotopes emit ionizing radiation, their use is strictly regulated and carried out with protocols to minimize exposure to people and the environment.
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