nuclear radiation physics paper 1 (P7)
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8 Terms
What are the tree types of nuclear radiation?
Alpha beta and gamma
Which type of nuclear radiation is the most ionising?
Alpha
Which materials can stop the radiation?
Sheet of paper, thin aluminium sheet and thick led or concrete
What is radioactive activity?
The rate at which a source of unstable nuclei decays
What is count rate?
Number of decays recorded each second
What is half-life of a radioactive source?
Time taken for half the unstable nuclei to decay or the time talked for the count rate to halve
What is irradiation?
Exposing an object or nuclear radiation
What is radioactive contammination?
Unwanted presence of substances containing radioactive atoms on or in other materials