Optically stimulated luminescence dating method

Optically Stimulated Luminescence (OSL) is a method for measuring doses from ionising radiation.The method makes use of electrons trapped between the valence and conduction bands in the crystalline structure of certain types of matter (such as quartz, feldspar, and aluminium oxide).The luminescent signal can be set to zero by exposure to eat or light.For pottery, the zeroing takes place during manufacturing when minerals used for dating are mainly quartz and feldspars.In diagnostic imaging the increased sensitivity of the OSL dosimeter makes it ideal for monitoring employees working in low-radiation environments and for pregnant workers.OSL is used in at least two applications: optical dating of ancient materials: mainly geological sediments and sometimes fired pottery, bricks etc., although in the latter case thermoluminescence dating is used more often radiation dosimetry, which is the measurement of accumulated radiation dose in the tissues of health care, nuclear, research and other workers, as well as in building materials in regions of nuclear disaster To carry out OSL dating, mineral grains have to be extracted from the sample.I am most interested in Luminescence Dating because it includes the least destructive method of testing.This type of dating measures charged electrons and can be used for dating samples even farther back than radiocarbon dating.

It is used to find the approximate age of an artifact.The second method of Luminescence Dating is Electron Spin Resonance .ESR assesses the amount of trapped electrons by measuring the amount absorbed by the sample.The electrons that have been excited to the conduction band may become entrapped in the electron or hole traps.Under stimulation of light the electrons may free themselves from the trap and get into the conduction band.

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