The amount of radioactive isotope remaining can be calculated:
Nt = No x (0.5)number of half-lives
Where:
Nt = amount of radioisotope remaining
No = original amount of radioisotope
number of half-lives = time ÷ half-life
Nt = amount of radioisotope remaining
No = original amount of radioisotope
number of half-lives = time ÷ half-life
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