A new technique for the determination of Fe57 source Mössbauer fraction is described. Based on analysis of the Mössbauer spectrum of chemically prepared Fe powder, the self-consistent technique offers two advantages over the commonly used “black-absorber” technique: increased precision and reduced cost. Details of the Fe absorber preparation are described and analytical techniques for the estimation of granularity correction in the absorber are presented. The technique is applied to the determination of the Mössbauer fraction of Fe57 in a 46mCi Co57 in Cr source yielding fs = 0.756 ± 0.010 where fs is the fraction of resonant 14.4 KeV γ-rays in the spectrum emitted from the source. This result is compared with that obtained using a black-absorber.
Iron Powder Effective Thickness Absorption Area Iron Oxalate Recoilless Fraction
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