MOSSBAUER-EFFECT OF EU-151 IN EUROPIUM OXALATE AND FLUORIDES

In a short communication [C.I. Wynter et al., Radiochimica Acta 55 (19 91) 111.] we reported ''relative broadening factors'' of europium fluo ride (EuF3), europium oxide (Eu2O3), europium oxalate decahydrate (Eu2 (C2O4)3.10H2O and europium benzoate tetrahydrate Eu(C6H5COO)3.4H2O. In dications of the ''relative broadening factor'' of the oxalate compare d to the fluoride suggested that the oxalate may indeed be a better ho st for the 21.6-keV gamma ray transition than the fluoride. In a conti nuing search for a better host matrix for this Mossbauer transition, w e have prepared additionally a systematic series of fluorides, namely. EuF3, NaEuF4, Na3EuF6, and K3EuF6 to measure the linewidths and compu te the ''true'' broadening factor using the natural linewidth of Eu-15 1 as 1.31 mm/s.