decay

• alpha particle(same as helium nucleus)
• what is mass and charge of alpha particle?

  m= 4 c= 2
• alpha decay makes a different element. alpha particles are most ionising and least penetrating types of radiation e.g. skin, air
• How are atoms ionised?

  if atoms lose or gains electrons and becomes charged particle
• What is Beta-

  Fast moving electrons which is made when neutron becomes proton
• what is mass and charge of beta- (same as electron)

  m= 1/2000 c= -1
• Beta- decay makes new elements
• Beta- is less ionising than alpha particles and more penetrating than alpha particles
• Beta- and Beta+ are blocked by thim metal(aluminium) or air
• beta+ particles are positron(positive elctrons)
• what is mass and charge of beta+ (opposite of beta-)?

  m= -1/2000 c=+1
• Beta+ decay makes new element
• in radioactive decay a positron is emitted from nucleus when proton splits into neutron and positron
• gamma decay are high energy electromagnetic radiation emitted from nucleus
• gamma decay is blocked by:

  • thick lead
  • metre of concrete
  • many km of air
• gamma decay

  • least ionising type of radiation
  • most penetrating type of radiation
• gamma decay removes energy to make nucleus stable
• what is mass and charge of gamma decay?


  m= 0 c= 0
• in neutron decay neutron is fired out makes an isotope
• What is mass and charge of neutron decay?

  m= 1 c= 0