Sodium-24 is a radioactive isotope that is used in diagnosing circulatory disease. It decays into stable isotopes of sodium at a rate of 4.73 % per hour. a. Technicians inject a quantity of sodium-24 into a patient's bloodstream. Write a formula for the amount of sodium-24 present in the bloodstream as a function of time. Use A for the initial amount of sodium-24. S(t) = Preview b. How long will it take for 75 % of the isotope to decay? Answer exactly or round to 3 decimal places. hours Preview

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**Sodium-24 Decay in Medical Diagnostics**

Sodium-24 is a radioactive isotope used in diagnosing circulatory disease. It decays into stable isotopes of sodium at a rate of 4.73% per hour.

**Exercises:**

**a. Formula for Decay:**
Technicians inject a quantity of sodium-24 into a patient's bloodstream. Write a formula for the amount of sodium-24 present in the bloodstream as a function of time. Use \( A \) for the initial amount of sodium-24.

\[ S(t) = \]

**b. Time for 75% Decay:**
How long will it take for 75% of the isotope to decay? Provide the answer exactly or rounded to three decimal places.

\[ \text{_____ hours} \]

**Get Help:** [eBook]
Transcribed Image Text:**Sodium-24 Decay in Medical Diagnostics** Sodium-24 is a radioactive isotope used in diagnosing circulatory disease. It decays into stable isotopes of sodium at a rate of 4.73% per hour. **Exercises:** **a. Formula for Decay:** Technicians inject a quantity of sodium-24 into a patient's bloodstream. Write a formula for the amount of sodium-24 present in the bloodstream as a function of time. Use \( A \) for the initial amount of sodium-24. \[ S(t) = \] **b. Time for 75% Decay:** How long will it take for 75% of the isotope to decay? Provide the answer exactly or rounded to three decimal places. \[ \text{_____ hours} \] **Get Help:** [eBook]
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