[en] It is reported on the results of measurements for determining the individual nuclides of radioactive rare gases in the vent air from the stack of the nuclear power plant Biblis, unit A, in the year 1976 in normal operation. Further, based on the measured release rates of radioactive rare gases, the radiological exposure by radioactive rare gases of the population in the environment of the nuclear power plant is assessed. A mean γ-dose factor of 1.3 x 10^-5 rem x m²/G x sec and a mean β-dose factor of 0.036 rem x m³/G x sec is evaluated. From these results for the whole body dose by γ-submersion at a distance of 100 m from the stack, a maximum value of 0.04 mrem/y, and for the skin dose by β-submersion at the point of maximum concentration at a distance of 500 m, a value of 0.02 mrem/y were determined. (orig./HP)