SummaryThe alpha half lives and energies ofGd 97.5 ± 6.5 yrs. 3.17 ± .02 MeVGd 1.78 ± (.08) • 10Sm 1.026 ± (.048) • 10The half life of

Six out of eight minor chemical elements, determined by spectroscopic and neutron-activation techniques, were found to be critical in computing a probability that a given copper artifact was derived from one of three types of copper ore: native metal, oxidized ore, reduced ore. Two elements, gold and tin, were apparently alloyed deliberately in many artifacts from both the Old World and the New World.

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