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Radioactive substances
________ give out radiation from the nuclei of their atoms- no matter what.
Half life
________ can be used to find the rate at which a source decays- its ACTIVITY.
short half life
A(n) ________ means the activity falls quickly, because the nuclei are very unstable and rapidly decay.
Radioactivity
________ is a totally random process.
radioactivity of a source
The ________ decreases over time.
graph
you can measure half life using a__
number of radioactive nuclei
half-life is the time taken for the___________in an isotope to halve
rate of source decay
half-life is used to find the__________
random
radioactive decay is entirely________
more slowly
long half-life means activity falls____
Note 
Flashcard (135)