  Prototype of gamma ray detector based on Micro Pixel Avalanche Photodiodes
(MAPD) with high pixel density 15000 pixel/$mm^2$, optically coupled to
Lutetium Fine Silicate (LFS) scintillator has been developed. The detection
performance investigated in the range of energy 59.6 - 662 keV at room
temperature. The results of measurements are presented in this work.
