represent α- and β-decay by a radioactive decay equation of the form 238 92 U → 234 90 Th + 4 2 α

calculate the energy of the gamma-ray photons emitted during the annihilation of an electron-positron pair

understand the exponential nature of radioactive decay, and sketch and use the relationship x = x0e^(-λt), where x could represent activity, number of undecayed nuclei or received count rate