A backscattering detector of high resolution was configurated with a transmission Be window to detect coversion electrons or 6.3 keV conversion X-ray of the

57

Fe source used for Mössbauer spectrum measurements. The energy resolution is 18% and 13% for 6.3 keV X-ray and 14.4 keV

γ

-ray

respectively. Its detection efficiency increases for low energy radiations. The detector and sample box system is desirable to set up a two-channel Mössbauer spectrometer

so as to obtain both absorption and backscattering spectra simultaneously.