  Recent years getting progress in the area of micropixel avalanche photodiode
makes them attractive as sensors for scintillation detectors. The performance
of the scintillation detectors is strongly tied to the physical properties of
MAPD. For this point of wives, we will investigate three types MAPD-3NK,
MAPD-3NM and MAPD-3NM-II for possible use in a scintillation detector.
Investigated avalanche photodiodes have the following parameters e.g low
operation voltage (90V$<$U$<$50V), high pixel density (4000 pixel/mm^2), high
photodetection efficiency (40%) and high gain (6*10^4). Gamma-ray detection
performance of tested scintillation detector based on MAPD was checked with
different gamma rays. Obtained results to confirm that this kind of
scintillation detectors can be successfully used for the next generation of PET
cameras in medicine.
