Gravitational Gamma Spectrometer for Studying the Gamma Resonance of the Long-Lived Isomer 103mRh

The principle of operation and the construction are described of the gravitational gamma spectrometer to study the gamma resonance of the long-lived isomer ${}^{103m}$Rh. This is a table-top device which measures the form of gamma resonance by the dependence of counting rate of gamma-rays in collimated beams on the angle of their inclination with respect of the horizontal plane. Methods of fabrication of gamma-sources for this device are considered.