Carbon dating process ppt


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Helium is named for the Greek Titan of the Sun, Helios . It was first detected as an unknown yellow spectral line signature in sunlight during a solar eclipse in 1868 by Georges Rayet , [5] Captain C. T. Haig, [6] Norman R. Pogson , [7] and Lieutenant John Herschel, [8] and was subsequently confirmed by French astronomer Jules Janssen . [9] Janssen is often jointly credited with detecting the element along with Norman Lockyer . Janssen recorded the helium spectral line during the solar eclipse of 1868 while Lockyer observed it from Britain. Lockyer was the first to propose that the line was due to a new element, which he named. The formal discovery of the element was made in 1895 by two Swedish chemists, Per Teodor Cleve and Nils Abraham Langlet , who found helium emanating from the uranium ore cleveite . In 1903, large reserves of helium were found in natural gas fields in parts of the United States, which is by far the largest supplier of the gas today.


Carbon dating process ppt

Carbon dating process ppt