Depth-wise core sediment profile of tissue free and organic bound tritium in dynamic marine environment
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Down core variation of tissue free and organic bound tritium in sediment cores was evaluated to assess the retention of tritium (H-3) by bottom sediment in the dynamic marine environment of Mumbai Harbour Bay. Tissue free water tritium (TFWT) was evaluated by extraction of H-3 from the sediment by extracting it in tritium free water whereas total H-3 by alkaline digestion of core sediment sample. OBT in various core fractions was evaluated by measuring the difference between total H-3 content and TFWT. Total H-3 content in the sediment core varies in the range of 0.41–8.01 Bq g−1 whereas OBT varies between 0.1 and 0.86 Bq g−1. Experimental results clearly indicate that total H-3 content in various fractions of the core sediment samples is dependent on the availability of exchangeable hydrogen which were either associated with clay minerals or organic molecule.
KeywordsTritium (H-3) Tissue free water tritium (TFWT) Organic bound tritium (OBT) Bottom sediments Organic carbon (OC) Liquid scintillation counter (LSC)
The authors sincerely acknowledge the encouragement provided by Dr. B. N. Jagatap, Director, Chemistry Group, BARC and Dr D. N. Sharma, Director H S & E Group. Authors also acknowledge the scientific inputs provided by Dr. AVR Reddy and Dr K. S. Pradeep kumar to complete this research.
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