an X-radiation source with a group of narrower energy-spectral distributicn ranging fron 55 to 150keV. The radiation source can be vsed to calibrate the instruments for radiation detection. Together with a K-fluorescent X-ray source and reference
γ
-ray sources such as
51
Cr
137
Cs
60
Co etc.
it is a useful tool for detailed studies of the energy response of some dosimeters.