radiation

• the more balanced the number of protons and neutrons is in a nucleus

  the more unstable the nucleus is
• mass number is the

  top number
• the atomic number is the

  bottom number
• if there are too many neutrons in the nucleus it is

  very unstable
• when a nucleus is unstable it will undergo

  radioactive decay in order to become more stable
• activity is the rate at which a source of

  unstable nuclei decays
• activity of radioactive decay is measured in

   Becquerel (Bq).
• count-rate is the number of

  decays recorded per second
• radiation is detected using a

  Geiger-Muller tube
• ionisation is when radiation collides with


  neutral atoms or molecules , it alters their structure by knocking of electrons

  this will leave behind ions -ionising radiation
• radioactivity is what type of process

  random
• radiation is done when an

  isotopes nucleus is unstable