“Cut-off” reflectors, which allow obtaining a reflected beam with almost no high energy radiation, as well as different monochromator
devices that reflect a beam of monoenergetic and polarized radiation are the most widely employed artifacts to perform the
excitation radiation improvement in analytical “non-expensive” TR spectrometers. The aim of this work consisted in testing
several monochromator devices: a multilayer structured mirror for soft X-rays (0.7–12.5 nm), as well as different bent and
flat crystals of wavelength dispersive spectrometers. The achieved instrumental detection limits for the selected monochromator
device are compared with the values obtained using a Suprasil Cut-off reflector and a C-W multilayer (d∼5 nm). Several human corporal fluid samples were analyzed to compare the spectral characteristics when using the Cut-Off
Reflector and the RAP flat crystal, respectively.