  The goal of the Medium Energy Gamma-ray Astronomy (MEGA) telescope is to
improve sensitivity at medium gamma-ray energies (0.4-50 MeV) by at least an
order of magnitude over that of COMPTEL. This will be achieved with a new
compact design that allows for a very wide field of view, permitting a
sensitive all-sky survey and the monitoring of transient and variable sources.
The key science objectives for MEGA include the investigation of cosmic
high-energy particle accelerators, studies of nucleosynthesis sites using
gamma-ray lines, and determination of the large-scale structure of galactic and
cosmic diffuse background emission. MEGA records and images gamma-ray events by
completely tracking both Compton and pair creation interactions in a tracker of
double-sided silicon strip detectors and a calorimeter of CsI crystals able to
resolve in three dimensions. We present initial laboratory calibration results
from a small prototype MEGA telescope.
