Use of k0-ENAA technique for Evaluation of Th, U and K in Sediments for Archaeometry Studies

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Author(s) Njinga R.L | Jonah S.A | Oladipo M.O.A | Ewa I.O.B | Alfa B
Pages 391-399
Volume 1
Issue 8
Date August, 2012
Keywords k0-IAEA program, NIRR-1, Archaeological sediments, Reference Standard sample material, k0-ENAA and k0-INAA technique.
Abstract

The Evaluation of Th, U and K in Sediments for archaeometry studies using k0-ENAA Technique and k0-IAEA program has been implemented in NIRR-1. The samples were irradiated at a thermal power level of 15.5 kW which correspond to a neutron flux setting of 5.0 x 1011 cm-2 s-1 for approximately 6 hours. The results of the IAEA Lake sediment-SL-1 and NIST Coal Fly Ash 1633b Standard Reference Material (SRM) showed good agreement with the certified (or literature) values using the k0-IAEA program. Within the ten archaeological sediments samples, the concentration of K was found in ranged of (0.0041±0.024 to 3.31±0.025) %, Th/Pa (4.38±0.037 to 10.08±0.15) mg/kg and U/Np (2.00±0.077 to 2.71±0.076) mg/kg. Among the samples analyzed; sample-E (2nd Tat.AHM3), sample-I (4th Tat.1HYS), and sample-J (3rd Tat.2YS), had very low concentration of Th, U and K. These low concentrations are attributed to signal resetting or signal zeroing due to serious application of heat. However, the concentration values of Th, U and K were obtained within a waiting period of three to five days compared to twenty to twenty four days using k0-INAA technique.

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