Direct-reading dosimeters used for monitoring radiation in Salyut stations

The PPD-2 dosimeter was used for daily radiation dose measurements of the same site of the Salyut-3, Salyut-4 and Salyut-5 stations (1974-1977). The doses were estimated to be about 13-16 mrad/day. During the flight of the Salyut-6 station (1977-1979) daily doses were measured at different sizes and varied significantly. By 1980, due to an increase in solar activity and lack of solar flares, the difference in the daily doses inside the station (except for the transfer module) reached the level of the error of measurements.