In the spectral range from 113-300 nm laboratory tests and calibration of t
he EUV radiometer were made by means of a deuterium lamp with a MgF2 window
. An open secondary electron multiplier was used as a detector in combinati
on with filters of LiF, CaF2, and SiO2. The results of the measurements wit
h inclusion of the quantum yields of the secondary electron multiplier are
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