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in the "datetime" attribute you should put a machine-readable value which represent time , the best value is a full time/date with ISO 8601 ( date('c') ) ,,, the attr will be hidden from usersand it doesn't really matter what you put as a shown value to the user,, any date/time format is okay !
Commercial dating service For over 15 years the laboratory has undertaken luminescence dating of archaeological materials and sediments on a commercial basis or research basis.
Play a game that tests your ability to match the percentage of the dating element that remains to the age of the object.
ISO 8601 date strings, of the form 'yyyy-MM-dd' (for example 2004-06-22) is also allowed. When binding to Date objects, it is advised to create the Date object with maximum value for any date-time components that aren't displayed (usually hours, minutes, seconds, milliseconds) to allow the largest range of values to be accepted.
The calculated age is the time since the last exposure to sunlight or intense heat. Equivalent dose is the amount of radiation dose that is necessary to account for the measured luminescence signal, in other words, how much radiation is needed to get from zero luminescence to the current, natural luminescence. Luminescence dating has been applied (depending on conditions) from sediments ranging from 10 – 10, although more commonly the upper limit is 100-400ka.
It has been applied to aeolian, fluvial, lacustrine, glaciogenic, coastal and marine applications, in addition to a wide range of research in archaeology and art antiquity.