background radiation

• background radiation is the

  constant low level radiation in the environment

  
• dose of radiation is measured in

  servets
• radioactive pollution is is from

  nuclear testing

  nuclear power

  industrial medical waste
• background radiation is low in magnitude so it is not 


  harmful
• examples of back radiation are

  cosmic rays

  radon gas

  food

  medicine

  
• radioactive isotopes with a short half life often give

  high dose of radiation in a short period of time so are often dangerous

  
• irradiation does not cause the object to become

  radioactive
• most sources of background radiation come from

  cosmic rays

  animals

  soil and plant

  rock

  
• Some rocks contain radioactive substances that produce a radioactive gas called 


  radon

  
• examples of artificial radiation include

  X-rays

  nuclear missles

  nuclear power