Question
Sodium- 24 is a diagnostic radioisotope used to measure blood circulation time. How much of a 20 -mg sample of sodium- 24 remains after 1 day and 6 hours if sodium- 24 has $t_{1 / 2}=15$ hours?
Step 1
The half-life of Sodium-24 is 15 hours. The total time that has passed is 1 day and 6 hours, which is equivalent to 30 hours. Therefore, the number of half-lives that have passed is $\frac{30}{15}=2$. Show more…
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Sodium- 24 is a diagnostic radioisotope used to measure blood circulation time. Calculate the mass (mg) of a $20-\mathrm{mg}$ sample of sodium- 24 that remains after 1 day and 6 hours if sodium- 24 has $t_{1 / 2}=15$ hours.
Eodium- 24 is a diagnostic radioisotope used to measure blood circulation time. How much of a 20 -mg sample remains after 1 day and 6 hours if sodium- 24 has $t_{1 / 2}=$ 15 hours?
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