Stellar Radioactivities and diffuse gamma-ray line emission in the Milky   Way
  After a short historical introduction to the field of gamma-ray line astronomy with radioactivities, I present an overview of recent results concerning the massive star yields of those radioactivities. I comment on the implications of those results (concerning long-lived radioactivities, like Al-26 and Fe-60) for gamma-ray line astronomy, in the light of past (COMPTEL and GRIS) and forthcoming (INTEGRAL) observations 
Nikos Prantzos (Institut d'Astrophysique de Paris)