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Radioactive decay


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Radioactive Decay
Alpha Decay
Beta Decay
Gamma Decay
Units of Radiation

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Radioactive decay

  1. 1. RADIOACTIVE DECAYSarbjitJoanMarielJoelKielle
  2. 2. Radioactive Decay The process by which an atomicnucleus of an unstable atom loses energy by emitting ionizing particles.
  3. 3. BetaAlpha Decay GammaDecay (β) Decay (α) (γ) Radioactive Decay
  4. 4. Alpha Decay Occurs when the nucleus ejects an alpha particle (helium nucleus).- This could barely pass through a single sheet ofpaper. Deflected as a positive particle in a magneticfield.
  5. 5.  An example of an alpha decay involves uranium-238:
  6. 6. Beta Decay Is the emission of a beta particle, or electron, by a radioactive nucleus.- This can pass through about 3mm of aluminum.Deflected as a negative particle in a magnetic field.
  7. 7.  An example of an beta decay
  8. 8. Gamma Decay It is the release of energy in the form of high-frequency electromagnetic waves.- This can pass can pass through several centimetersof LEAD! Not deflected in a magnetic field.
  9. 9. Units of Radiation 1 gray = 1Gy = 1 J/kg 1 rad = 10ˉ Gy radiation absorbed dose
  10. 10. Type and Energy of RBE Radiation X-rays 1) Gamma rays 1Beta particles (>30 keV) 1Beta particles (<30 keV) 1.7Neutrons (<0.02 MeV) 2-5 10 (body), Neutrons (1-10 MeV) 30 (eyes) 10 (body), Protons (1-10 MeV) 30 (eyes Alphas from natural 10-20 radioactivity
  11. 11. 1 rem = REB x 1 rad roentgen equivalent man