With incident 7 rays of energy 662 keV the energy spectrum of the photons inelastically scattered by the i£-shell electrons of lead has been studied, employing Nal(Tl) scintillation spectrometers and coincidence techniques. The energy spectrum of the 7 rays scattered at 124° to the incident direction is observed to be a continuum from zero energy to about 570 keV. At 60° also the spectrum shows the same trend. The observed photon energy spectrum is found to differ to a very great extent from that calculated on the basis of the various nonrelativistic theories.The cross section for the inelastic scattering of the 662-keV 7 rays by a i£-shell electron of lead, at 124°, for scattered photon energy greater than 160 keV is estimated to be (1.78±0.16) times that by a free electron.

= (34±7) X10-5 ]. The theoretical values are: El El Ml Ml G;KX10 +5 = 28 68 66 165.Both results are nearest to the coefficient of El. The direction-polarization correlation measurements exclude El and Ml. With these latter results, one is only left with a choice between El and Ml which puts the decision for El beyond any doubt. The decay scheme of Sr 88 is then 3~, 2+ 0+

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