Methods of determining the recoilless absorption probability of Moessbauer radiation. I

This article treats a method of determining the recoilless absorption probability of Moessbauer radiation with the use of a control absorber. By means of this absorber the influence of the background on the value of the Moessbauer effect and on the resonance curve area, measured experimentally, is being eliminated. A method for determining the theoretical values of the effect and the area of the control absorber, as well as the results of the experimental check-up of the method for CaSnO3 are also described. The value, obtained for f'=0.574+-3% confirms some of the results given in the literature. (Auth.)