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To learn about some uses of radioactivity in our lives

Objectives. To learn about some uses of radioactivity in our lives. Some Uses Of Radioactivity. Food Sterilization Medical Applications and Radiotracers Smoke detectors Radiocarbon Dating (Energy Production) (Weapons). Food Sterilization.

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To learn about some uses of radioactivity in our lives

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  1. Objectives • To learn about some uses of radioactivity in our lives

  2. Some Uses Of Radioactivity • Food Sterilization • Medical Applications and Radiotracers • Smoke detectors • Radiocarbon Dating • (Energy Production) • (Weapons)

  3. Food Sterilization • Gamma irradiation of foods often from 60Co source • Spices, herbs and dehydrated vegetables. Also pork and poultry • FDA approved

  4. Medical Applications of Radioactivity • Radioactive nuclides can be introduced into laboratory reactions or organisms and traced for diagnostic purposes. • Radiotracers

  5. Medical Applications of Radioactivity - Scanners • Medical Scanners utilize many types of radiations • X-Rays – Bone structures opaque to rays • X-ray computed tomography (CT Scan – X-rays) • Magnetic Resonance Imaging (MRI – Nuclear magnetism) • Ultrasound (high frequency sound waves) • Positron Emission Tomography (PET Scan) • Positron emitting tracer into body, concentrates in organ of interest • Positrons annihilate with electron giving off pairs of gamma rays • Detector maps pair to show image of organ

  6. Smoke Detectors • Americium-241 emits alpha particles and ionizes air in a space in the detector • Ions allow a current to flow • Smoke absorbs alpha particles, interferes with ion formation and electric current. An alarm sounds

  7. Dating by Radioactivity • Radiocarbon dating • Originated in 1940s by Willard Libby • Based on the radioactivity of carbon-14 • Used to date wood and artifacts up to about 50,000 years old Radiocarbon dating activity

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