the amount of radiation a sample has received during the time elapsed between the zeroing of the ESR clock (t = 0) and the sampling (t = T).

electron spin resonance dating-32

Electron spin resonance (ESR) has been used for absolute dating of archaeological materials such as quartz, flints, carbonate crystals, and fossil remains for nearly 50 years.

The technique is based on the fact that certain crystal behaves as natural dosimeters.

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After a short time, electrons eventually recombine with the positively charged holes left in the valence band.

Since natural materials are not always perfect, sometimes electrons are trapped between energy levels.

The trapped electrons form para-magnetic centers and give rise to certain signals that can be detected under an ESR spectrometry.

The amount of trapped electrons corresponds to the magnitude of the ESR signal.

Electron spin resonance dating can be described as trapped charge dating.