  Measurements of intrinsic conductivity and X-ray induced conductivity were
performed on specially undopped ZnSe samples. The measurements demonstrated
that sensors made of ZnSe have minor intrinsic conductivity when heating up to
the temperature of 180 {\deg}C, and significant X-ray induced conductivity.
Dose dependence "dose rate - current" is described with simple power function
which considerably simplifies calibration of sensors. This results can be used
during the designing of high-temperature X-ray and gamma-radiation detectors
for radiation hot rolling thickness gauges which are widely used in the
metallurgy.
