Connect a half-life to the time taken for an isotope’s activity or undecayed nuclei to halve, and explain why short-lived tracers are made near hospitals.
This question is about radioactive isotopes used for medical imaging.
lodine-131 is represented by this symbol.
Iodine-131 is radioactive and decays with a half-life of 8 days.
State what is meant by the term half-life.
time taken;
allow "how long it
takes"
reject "half the time"
and either of for (radio)activity to halve;
for half of the (radioactive) \{nuclei / atoms / isotope / mass\} to decay;
allow count rate for
activity
ignore substance