Half Life (AQA A-Level Physics): Flashcards

Radioactive substances used in imaging and therapy

Physical decay process and biological excretion

Time for nuclei to halve due to radioactive decay

Time for half of substance to be removed by biological means

Simultaneously

Time for activity to halve considering both decay & elimination

$\frac{1}{T_E} = \frac{1}{T_b} + \frac{1}{T_p}$

$T_E$ is always shorter than $T_p$

Determines optimal dosage and timing for radionuclide therapies

Approximately 2.67 hours