A description is given of a simple luminescent detector of radiation i
n the VUV range (10-100 nm) and of a method for absolute calibration o
f the sensitivity (quantum efficiency) of this detector. The detector
and multilayer normal-incidence mirrors were used in determination of
the absolute yield of the radiation from a laser plasma and in absolut
e calibration of the UF-4 photographic film at the wavelength of 18 nm
.