The field of medium-energy gamma-ray astronomy urgently needs a new mission to build on the success of the
COMPTEL instrument on the Compton Gamma Ray Observatory. This mission must achieve sensitivity significantly
greater than that of COMPTEL in order to advance the science of relativistic particle accelerators, nuclear astrophysics,
and diffuse backgrounds, and bridge the gap between current and future hard X-ray missions and the high-energy Fermi
mission. Such an increase in sensitivity can only come about via a dramatic decrease in the instrumental background.
We are currently developing a concept for a low-background Compton telescope that employs modern scintillator
technology to achieve this increase in sensitivity. Specifically, by employing LaBr3 scintillators for the calorimeter, one
can take advantage of the unique speed and resolving power of this material to improve the instrument sensitivity while
simultaneously enhancing its spectroscopic and imaging performance. Also, using deuterated organic scintillator in the
scattering detector will reduce internal background from neutron capture. We present calibration results from a
laboratory prototype of such an instrument, including time-of-flight, energy, and angular resolution, and compare them
to simulation results using a detailed Monte Carlo model. We also describe the balloon payload we have built for a test
flight of the instrument in the fall of 2010.