An isotope of Indium, Indium-111 (49111In^{111}_{49}\text{In}49111In), is a gamma emitter widely used as a radioactive tracer in nuclear medicine, particularly for locating infections and imaging inflammatory processes.
State two distinct reasons why a tracer that only emits gamma radiation is preferred for internal diagnostic imaging over tracers that emit alpha or beta radiation.
An Indium-111 tracer sample is prepared with an initial activity of 180 MBq180\text{ MBq}180 MBq. The half-life of Indium-111 is 2.80 days2.80\text{ days}2.80 days.
Calculate the number of Indium-111 nuclei initially present in this tracer sample.
Calculate the time, in days, required for the activity of the tracer to decrease to 8.0%8.0\%8.0% of its initial activity.
90 exam-style questions on OCR A A Level Physics Nuclear and particle physics, covering The nuclear atom, Fundamental particles, Radioactivity, and Nuclear fission and fusion. Each one has a worked solution and a mark scheme showing where the marks go.