How do high levels of background radiation be harmful?
As it ionises substances it passes through
How much do nuclear power contributes to background radiation?
What is the major source of background radiation in air?
Where is radon gas found?
Seeps through the ground from radioactive substances in rocks deep ungeround
How is radon gas a health hazard if breathed?
Emit alpha particles
Examples sources of background radiation?
Cosmic rays from outer space
food and drink
nuclear weapon testings
medical applications such as X-ray
What do used fuel rods from nuclear power stations contain?
Lots of radioactive isotopes with long half-lives
What happens after unused uranium and plutonium has been removed for future use?
Rods must be stored in secure conditions for many years until radiation levels are safe
Example of nuclear fissions not acting safely?
Chernobyl in 1986
None of the reactors of that type aren't used now
designing safe nuclear power station
What depends on the effects of radiation time?
Types of radiation dose
whether source is inside or outside of the body
What happens to risk of cancer the higher the dose of radiation?
Higher risk of cancer