The resonance scattering of a gamma rays constitutes the nuclear analogue to the wellknownrnoptical fluorescence effect .Since then several methods have been developedrnwhich led to the observation of resonance scattering or absorption in a number of firstrnexcited nuclear states. A major break through took place in 1958 when the phenomenonrnof recoilless nuclear resonance absorption was discovered . This new absorption effectrnprovided a means for the elimination of the energy losses by recoil , these being thernmost serious obstacle for the observation of nuclear resonance absorption orrnscattering .Simultaneously gamma lines of utmost narrowness became available .It isrnthis particular feature which opened wide range of applications for new effect , in suchrnfields as nuclear physics ,solid state physics, and relativity, and made possiblerninvestigations which could not even be considered only a few years ago