| A | B |
|---|
| granite | rock that is a source of radon gas |
| 10% of background radiation | cosmic rays |
| water industry tracer | beta emitting fed into pipework |
| americium 241 in smoke alarm | alpha source ionises the air |
| passes through sealed plastic bags | gamma radiation in sterilising medical equipment |
| cobalt 60 gamma source | used to kill cancer cells |
| the rate of decay of nuclei | the" activity" of radioactive source |
| becquerel | unit of activity |
| half life | time taken for half undecayed nuclei to decay |
| 50.1% of background radiation | radon gas (odourless/colourless) |
| dose equivalent (sieverts) = | absorbed dose (in grays)xQ |
| alpha -most ionising | can't penetrate skin but can be inhaled |
| problems of storage/disposal | nuclear waste |
