We present the latest update of the 1.809 MeV sky survey obtained with
COMPTEL. Based on all observations taken since the launch of CGRO in spring
1991 to early summer this year we obtain 1.809 MeV all sky maps using different
imaging methods. The background is modelled on the basis of an adjacent energy
approach. We confirm the previously reported characteristics of the galactic
1.809 MeV emission, specifically excesses in regions away from the inner
Galaxy. The observed 1.8 MeV gamma-ray line is ascribed to the radioactive
decay of 26Al in the interstellar medium. 26Al has been found to be
predominantly synthesised in massive stars and their subsequent core-collapse
supernovae, which is confirmed in tracer comparisons. Due to this, one
anticipates flux enhancements aligned with regions of recent star formation,
such as apparently observed in the Cygnus and Vela regions.
