ИСТИНА

At present gamma-ray detectors are placed by the Laboratory of Cosmic Rays, Polar Geophysical Institute (PGI) at six stations: Barentsburg (78º N, the Spitsbergen archipelago), Tixie (71º N, the Laptev Sea), Apatity (68º N, the Kola peninsula), Yakutsk (62º N, East Siberia), the Houlougay-Sha peak (52º N, the Sayan mountains, 3000 m), Rostov-on-Don (47º N, the middle latitude plain). Except for the Alpine Houlougay station, other stations are located at sea-level. At all the stations, soft gamma radiation monitoring (20-400 KeV) is carried out by means of uniform calibrated scintillation detectors NaI(Tl), Ø60×20, which are made at PGI. These detectors placed into a lead shield, with walls thickness of 5 cm and opened from the top, get radiation only from the upper hemisphere. At Apatity and Barentsburg stations observations have been continuously carried out since 2010, at other stations, since 2016. The two stations are equipped with a complex to monitor the main secondary components of cosmic rays, such as hadronic, charged and electromagnetic ones.