(a)[1]
PET scanning uses a tracer. Explain what is meant by a tracer.
(b(i))[1]
PET scanning involves annihilation. Explain what is meant by annihilation.
(b(ii))[1]
State the names of the particles taking part in the annihilation process.
(c(i))[1]
Calculate the total energy released in a single annihilation event in (b).
(c(ii))[2]
Calculate the wavelength of each gamma photon emitted.
(d)[3]
Explain how the gamma photons are used to form an image.