Half Life (AQA A-Level Physics): Quizzes

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Half Life
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What are radionuclides used for in medical applications?

Imaging and therapeutic applications

What is the physical half-life TpT_p of a radionuclide?

Time for half the nuclei to decay

What is the biological half-life TbT_b?

Time for half to be removed by body

How do physical decay and biological excretion occur in the body?

Simultaneously

What does effective half-life TET_E measure?

Time for activity to halve by both processes

What is the formula for effective half-life?

1TE=1Tb+1Tp\frac{1}{T_E} = \frac{1}{T_b} + \frac{1}{T_p}

How does effective half-life compare to physical half-life?

Always shorter

Why is effective half-life important in medicine?

Determines optimal dosage and timing

If Tp=8T_p = 8 hours and Tb=4T_b = 4 hours, what is 1TE\frac{1}{T_E}?

38\frac{3}{8}

With Tp=8T_p = 8 hours and Tb=4T_b = 4 hours, what is the effective half-life?

Approximately 2.67 hours

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Radionuclide Imaging and Therapy

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