radiation protection

• what is the inverse square law


  • the intensity of radiation at a given distance from the point source is inversely proportional to the square of the distance
  • providing there is no absorption or scattering by the medium through which the radiation passes
• describe the three ways of reducing radiation exposure 


  • limit time
  • increase distance
  • use shielding
• describe the PPE equipment that can be used in diagnostic imaging


  • lead rubber aprons
  • thyroid shields
  • lead glasses
• explain the features of the x ray room that help to ensure radiation protection 


  • the x ray room walls and doors are lead lined to ensure that any radiation is contained within the room
  • doors should contain locks to prevent people entering the room when exposing
  • lead lined protective booth for operators to stand behind when an exposure is being undertaken
  • warning signs are present outside of the x ray room
• what radiation protection considerations need to be taken when undertaking an x ray examination outside of the x ray department


  • everyone is 2m away from the x ray tube
  • call out before exposing
  • only the patient is in the primary beam
  • if assistant is needed and the person is female within childbearing age LMP check will need to be performed
  • if someone is required to stay within 2m to immobilise the patient they must wear a lead rubber apron, LMP check be undertaken and they must not have any anatomy such as fingers within the primary beam