Astrophysical Radionuclides: Where are they and what can they tell us?

Radionuclides provide for a unique probe into some of the most
interesting phenomena in contemporary astrophysics. The MeV gamma-rays
emitted by radionuclides allow us to see deep into the objects that
house these radioactive isotopes.  I will present a high-level
overview of astrophysical sites for radionuclides including stars,
supernovae, novae, neutron stars, and the interstellar medium.  The
presence of radionuclides in these astrophysical sites provides a
means for answering questions about a variety of interesting
astrophysical phenomena including nucleosynthesis, the evolution and
enrichment of galaxies, mechanisms for stellar explosions, and origin
of r-process elements.  This general overview will be followed by a
more detailed focus on prompt radioactive decay emission from
transient explosions such as supernovae and kilonovae.