topic 4

Cards (18)

  • what is a chain reaction
    self sustaining series of reactions
  • define fusion
    two nuclei collide at high speed and join to create a heavier nucleus
  • define fission
    release of energy from a large and unstable atoms by splitting them into smaller atoms
  • 2 ways radation is used in medicine
    x rays
    medical tracers
  • define contamination
    unwanted radioactive atoms get onto an object, which may emit radiation
  • define irradiation
    exposure to radiation and doesnt make it radioactive
  • give two aspects of your life that could affect your radiation dose
    where you live
    what job you have
  • define radiation dose
    the risk of harm to body tissues due to exposure to radiation
  • what type of nuclear decay doesnt change the mass or charge of a nuetron
    gamma rays
  • give alpha, beta and gamma radiations range in the air
    alpha -cms
    beta-a few meters
    gamma- a long distance
  • give alpha, beta and gamma radiations ionising power
    alpha- strong
    beta- moderate
    gamma- weak
  • name for things that may be emmited during radioactive decay
    alpha particles
    beta particles
    gamma rays
    nuetrons
  • what is radioactive decay
    the process of unstable atoms giving out radiation to become more stable
  • true or false, isotopes have different mass numbers
    true
  • what is the atomic number of an atom
    the number of protons in an atom
  • which number defines what element an atom is, atomic or mass
    atomic
  • what happens to an atom if it looses one or more of its outer shell electrons
    it becomes positively charged
  • true or false, atoms have no overall charge
    true