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[en] The operation of the densimeter on the Venera 10 automatic interplanetary station is described. The densimeter provides rapid and precise determination of rock density by the radiation method. The main components of the instrument are sensors and an electronic unit. The high temperature Geiger counter with neon-xenon-oxygen filling is used as γ-radiation detector. As the sensor operates at 500 deg C, measures have been taken to reduce the influence of insulation leakage on the instrument reading. The insulation of a connecting cable is made of high temperature fibre glass, the resistance in the detector circuit at 500 deg C being not lower than 1x10⁸Ohm. The electronic unit comprises power amplifiers, descriminators, vibrators and counting registers. To increase the unit operation reliability the registering unit of the instrument is based on integral schemes. Using the measurement results the surface rock density of the Venus is evaluated by 2.8 g/cm³ with mean square error of +-0.1 g/cm³

[en] A radiation densitometer for the first measurement of the Venusian rock density was installed on the automatic station 'Venera-10' which landed on the planet in 1975. As a result of the experiment it was established that the rock density is 2.8+-0.1 g cm^-3. The construction of the densitometer and its operation on the surface of the planet as well as the results of the experiment are given in this article. (Auth.)