Gamma-radiation background on board Russian orbital stations

Gamma-ray background measurements on board the Russian orbital stations Salyut-6, Salyut-7, Mir, Soyuz and Progress have been carried out since 1979. The dependencies of background intensity on mission mass, telescope orientation, and cut-off rigidity are presented for the energy intervals 0.1-8 MeV and 30-600 MeV. The background from man-made sources on board these spacecraft was investigated.