The decay of photoconductivity has been used to measure the lifetime of excess carriers in rectangular samples of germanium and silicon. The sample is illuminated by a short pulse of light and the sample lifetime obtained from an oscilloscope display of the decay of photoconductivity. Analysis of the solution of the diffusion equation yields methods of measuring the bulk lifetime, the surface recombination velocity, and the diffusion constant.
The beta-gamma angular correlations in the decay of a number of nuclides have been studied as a function of the beta-ray energy. Isotropic correlations were found in the decay of Co 55 , Co 56 , Co 60 , Na 22 , Na 24 , Cs 134 , and I 124 . Non-isotropic correlations have been measured in the decay of Rb 86 , Sb 124 , and I 126 . The interpretation of these results in terms of the properties of the emitted radiations and the nuclear energy states is discussed. A non-isotropic conversion electron-gamma-angular correlation was found in the decay of Mo 93 .
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