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The half-life is the time taken for an amount of a radioactive isotope to decay to half its original value.Because this decay is constant it can be used as a “clock” to measure elapsed time assuming the starting amount is known.Français : Le champ ultra profond de Hubble, une image d'une petite portion du ciel dans la constellation du Fourneau, prise par letélescope spatial Hubble du 3 septembre 2003 au 16 juillet 2004.La portion de ciel a été choisie car elle possède peu d'étoiles brillantesproches.Targets in multi-date scenes are extremely variable and have been nearly impossible to compare in an automated mode (Kim and Elman, 1990).In order to detect genuine landscape changes as revealed by changes in surface reflectance from multi-date satellite images, it is necessary to carry out radiometric correction.English: The Hubble Ultra Deep Field, is an image of a small region of space in theconstellation Fornax, composited from Hubble Space Telescope data accumulatedover a period from September 3, 2003 through January 16, 2004.

However, for gamma ray and X-ray dose measurements a unit such as the gray or sievert is normally used.Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age. The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.Libby received the Nobel Prize in Chemistry for his work in 1960.

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