Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Devices for gamma-radiation spectrometric detection within the burst can system for the vapourheating channels of RBMK-type reactor Volkov S.V., Volodin V.P., Makarov V.V., Yanin V.S., Andrianov T.V. The article contains the structure and the main operational parameters of two new detection units implemented on base of the gamma-scintillation detection blocks with NaI(Tl) 40x40 mm and 63x63 mm crystals: the unit for by-channel monitoring (BCMU) and group monitoring unit (GMU). The advantages of detection units in junction with the single-board spectrometer (SBS) are shown. The SBS can control the software of the photoelectron multiplier tube high-voltage and system of peak stabilization.