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An automated spectroradiometer for monitoring levels and doses of biologically active UV radiation has been developed. An original design of a double grating zero-dispersion monochromator is proposed. The main characteristics of the design have been tested and it has been shown that as to its parameters the spectroradiometer complies with the recommendations of the World Meteorological Organization for network meters of natural UV radiation. The results of monitoring the spectral distribution and daily doses of the solar UV radiation at the Minsk Ozone Station are presented, and the estimated values of their seasonal variations have been determined.

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