Module 2

  1. Isotopes
    number of neutrons that vary.
  2. 2H
    Deuterium, an isotope of hydrogen; Deuterium plus oxygen makes up so-called heavy water (D2O), a compound used as a tracer in metabolic studies.
  3. 3H
    Tritium; an isotope of hydrogen. Tritium is unstable and a tritium atom will fall apart, on average, after 12 yrs.  We call this half-life.
  4. Radioisotopes
    Some combinations of protons and neutrons that are unstable.
  5. Each time a fission occurs
    Three neutrons are produced and the nucleus splits into two.
  6. More neutrons are found in the nucleus than can be supported, and the .....
    nucleus is unstable
  7. 131I is a by product of
    Uranium Nuclear Fission
  8. Most radiation is due to
    natural sources.
  9. 01n
    Neutron; atomic number 0; mass number 1
  10. 11H
    Proton; atomic number 1; mass number 1
  11. 0-1e
    Beta particle (electron)
  12. 0+1e
    Positron (positive electron); atomic number 1; mass number 0
  13. 42He
    Alpha particle (helium nucleus); atomic number 2; mass number 4
  14. 21H
    Deuteron (heavy hydrogen nucleus); atomic number 1; mass number 2
  15. Y (similar symbol)
    Gamma particle (high energy photon); comes from nuclei; no charge; no measurable mass
  16. In an alpha particle what is missing
    two electrons
  17. Beta particles
    are electrons expelled at high energy from radioactive atoms.  For example, 3H is a beta emitter.
  18. A gamma particle is
    a high-energy packet of light energy (photon).  Photons of lower energy are visible light.
  19. photons are both
    particle and a wave
  20. Radio waves, microwaves, infrared, visible light, ultraviolet light, X-rays and gamma rays are all "made" of
    photons but with diferent momentum (energy) and different wavelengths.
  21. A wavelength is
    the distance between the crest of waves.
  22. The height of the wave
    is the intensity of the signal (e.g a bright light vs a dim light).
  23. Gamma radiation (photons) are both waves and particles.  These waves have both electrical and magnetic properties, we call them
    electromagnetic waves
  24. How to measure a wave length
    Wavelength is the distance between the peak of each wave crest. 

    Higher energy = more vibration = shorter lengths
  25. Visible light is in the range of about
    400 to 700nm (0.4 to 0.7)
  26. Low energy photons have
    long wavelengths
  27. _______ waves have the lowest energy and the longest wavelengths.
  28. __________ have the highest energy and shortest wavelengths.
    Gamma rays
  29. ROY G. BIV
    • Red.... lowest energy/longest wavelength
    • Orange
    • Yellow
    • Green
    • Blue
    • Indigo
    • Violet
  30. Who is ROY G. BIV
    the discoverer of light.
  31. X-rays
    are photons with a high enough energy to penetrate living tissue, so they are used for medical diagnostics.
Card Set
Module 2