The combination of household purchase surveys and stable isotopic composition in modern humans is found to be a valuable tool, especially with respect to determining the role of C3 and C4 plants through the complex modern food chain.
Two new isotopes of californium have been identified through bombardments of U, U, and 3U with C ions from the Oak Ridge isochronous cyclotron. They decay with half-lives of 3.78 +0.70 and 1.06 +0.15 min and with the emission of e particles of 7.335 +0.005 and 7.590 +0.010 MeV, respectively. Analysis of the excitation functions for these e emitters favors the assignment of mass 241 to the former and mass 240 to the latter; also, the 7.335-MeV activity was shown to be chemically similar to californium. New values for the~-particle energies of 4 Cf were obtained: 7.385 +0.004 and 7.351 +0.006 MeV, assigned, respectively, to e-decay transitions to the ground and first excited states of 8Cm.
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