background radiation

Question 1

how radioactivity is detected

Answer 1

photographic film that becomes darker as more radiation is exposed to it
Geiger muller tube, which gives an electrical signal each time radiation is detected which is converted into clicking sounds

Question 2

units used to measure radiation

Answer 2

bequerels

Question 3

radon gas

Answer 3

radon gas comes from rocks, which comes from radium as radium is naturally occurring rock
radon gas gives off alpha emissions, which are dangerous inside the lungs, but harmless outside the body

Question 4

where background radiation comes from

Answer 4

nuclear and other-1%
food and drink-10%
cosmic rays-12%
grounds and buildings-13%
medical equipment-15%
radon gas-49%