Climate and Human Evolution. Climate Effects on Human Evolution. Survival of the Adaptable. Potassium-argon dating, Argon-argon dating, Carbon-14 (or Radiocarbon), and Uranium series. All of these methods measure the amount of radioactive decay of chemical elements; the decay occurs in a consistent manner, like a clock, over long periods of time. Thermo-luminescence, Optically stimulated luminescence, and Electron spin resonance.
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Image caption Olorgesailie Basin: the dig site spans an area of 65 square kilometres. Humans may have developed advanced social behaviours and trade 100,000 years earlier than previously thought. Dr Marta Mirazon Lahr from the University of Cambridge said that being able to "securely date" the continuous occupation of the site using argon techniques on volcanic deposits "makes Olorgesailie a key reference site for understanding human evolution in Africa during ". Human origins. Dr Scerri, who was not involved in the studies, emphasised that they are valuable in implying that "Middle Stone Age technology emerged at the same time in both eastern and northwestern Africa. Prof Chris Stringer from the Natural History Museum agrees.
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Optical emission spectroscopic studies of laser-created argon sparks are carried out. Pulses of 532 nm and 8 ns from a frequency-doubled Nd:YAG laser are used to create an argon spark at 1 atm. Gated photography of 2 ns is used to investigate spark evolution at early times. Electron temperature and density measurements are made from the spectral data. The Stark broadening of emission lines is used to determine the electron density, and the Boltzmann plot of the singly ionized argon-line intensities is exploited for determination of the electron temperature.