Optically Stimulated Luminescence dating is a technique of dating Late Quaternary sediments
deposited by various transporting agencies after their erosion from parent rock.
Commonly occurring insulator minerals
like Quartz and feldspar are used as a dosimeter.
These minerals acquire radiation doses (De) from environmental dose rate (Dr) arise due to decay of radioactive elements
like U, Th and K and cosmic rays. Burial dose (De) is measured and annual dose rate (Dr) is calculated in the laboratory.
The simplest formula for estimation of age is, total dose accumulated in the minerals (De) divided by annual dose rate (Dr).
Advantages:
Directly gives the age. No calibration required
Can date material of few hundred to few lakh years.
Suitable for all sedimentary environments
Standard Operating Procedure
Instruments:
The OSL laboratory, GSI, Faridabad, is equipped with three OSL dating instruments
- Risoe TL/OSL DA-15 – 1no.
- Risoe TL/OSL DA-20 – 2nos.
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Existing Locations:
NCEGR, Faridabad
Additional Director General
National Mission Head-IV
Central Headquater
Geological Survey of India
15 A & B Kyd Street
Kolkata-700016
Fax- 033-22861716
Email- hodm4@gsi.gov.in
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