  The observed map of 1.809 MeV gamma-rays from radioactive Al-26 (Oberlack et
al, 1996) shows clear evidence of Galactic plane origin with an uneven
distribution. We have simulated the map using a Monte Carlo technique together
with simple assumptions about the spatial distributions and yields of Al-26
sources (clustered core-collapse supernovae and Wolf Rayet stars; low- and
high-mass AGB stars; and novae). Although observed structures (e.g., tangents
to spiral arms, bars, and known star-forming regions) are not included in the
model, our simulated gamma-ray distribution bears resemblance to the observed
distribution. The major difference is that the model distribution has a strong
smooth background along the Galactic plane from distant sources in the disk of
the Galaxy. We suggest that the smooth background is to be expected, and
probably has been suppressed by background subtraction in the observed map. We
have also found an upper limit of 1 Msun to the contribution of flux from
low-yield, smoothly distributed sources (low-mass AGB stars and novae).
