• The various emissions will differ considerably in their ability to go through matter, known as their penetrating ability.
  • The α-particle has the least penetrating power since it is the largest and slowest emission.
  • Beta particles are more penetrating than alpha particles, but can be stopped by a thin sheet of aluminum.
  • Of the three basic types of emissions, gamma particle are the most penetrating.
  • A thick lead shield is required to stop gamma emissions.
  • Positrons represent a special case in that they annihilate when they come in contact with electrons.
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