International Journal of Applied Science and Technology

ISSN 2221-0997 (Print), 2221-1004 (Online) 10.30845/ijast

Alternative Approach for Efficiency Data Generation in Neutron Activation Analysis
R.L. Njinga, I.O.B. Ewa, S.A., Jonah, A. Baba, Y.A. Ahmed, G.A. Agbo, J. Ebobenow, R. Nasiru


An efficiency calibration method has been developed to measure radioactivity of samples instantly with HPGe detectors without the continuous usage of standards sources. A co-axial HPGe detector was used for this experiment and the geometries of 17cm, 15cm and 2cm examined. Three fundamental techniques viz k0-IAEA, theoretical (fitted) and experimental measurements were used to examine and actualize this method known as effective solid angle derived efficiency technique within the energy range of 59.54 – 1408 keV. Plotted ratios of the k0-IAEA derived efficiency, theoretical (fitted) derived efficiency, and experimental full energy peak derived efficiency values over the instant effective solid angle derived efficiency values showed slight oscillations about unity at certain energies for 2cm and 17cm geometries attributed to the characteristics of the detector. The results of the ratio of k0-IAEA measurement, theoretical (fitted) derived efficiency data over the experimentally derived efficiency at 15cm showed an insignificant deviation of 0.2% at certain energy around the unity mark. Thus efficiency data obtained at this geometry were employed in the instant effective solid angle efficiency transfer technique and further determination of the instant efficiency at 1, 5, 10, 15, 20, and 25cm were obtained.

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