Positron emission tomography (PET scanning) detects gamma-radiation so that the point where positrons originate in the body can be located.
(a(i))[2]
Positrons do not occur naturally in the body. Explain how they become present in the body during PET scanning.
(a(ii))[3]
Explain how positrons lead to the emission of gamma-radiation from the body during PET scanning.
(b)[4]
Show that the wavelength of the gamma-radiation detected during PET scanning is about $2.4\,\text{pm}$. Explain your reasoning.
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