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Radiation Protection Dosimetry Advance Access originally published online on March 24, 2006
Radiation Protection Dosimetry 2006 119(1-4):442-445; doi:10.1093/rpd/nci500
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Luminescence dating of the barrier spit at Chilika lake, Orissa, India

A. S. Murray1,* and M. Mohanti2

1 Nordic Laboratory for Luminescence Dating, Aarhus University, Risø National Laboratory, DK 4000 Roskilde, Denmark
2 Department of Geology, Utkal University, Bhubaneswar 751004, Orissa, India

* Corresponding author: andrew.murray{at}risoe.dk

Optically stimulated luminescence dating has been used to investigate the chronological development of the outer barrier spit forming Chilika Lake (Orissa, India), the largest brackish-water lagoon in Asia. Sixteen samples were examined, and these yielded equivalent doses of between 153 ± 3 mGy and 2.23 ± 0.07 Gy, corresponding to ages from ~40 y at the top of the spit to ~300 y at the bottom. The youngest ages are consistent with the age of the overlying vegetation, and modern material taken from the sub-tidal beach gave a dose of 4 ± 2 mGy (corresponding to an age of 0.7 ± 0.4 y), confirming that any previous potential luminescence signal in the source sediment is completely set to zero before incorporation into the spit. A clearly defined period of >2.5 m of barrier construction ~40 y ago is identified; prior to that the deposition rate was relatively constant for ~300 y.


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