Neutron Spectra Parameters of Reaktor TRIGA PUSPATI for Activation by malj


									  Neutron Spectra Parameters of Reaktor TRIGA PUSPATI for Activation
                  without Standard Reference Material

                 Noorddin Ibrahima , Liew Hwi Fena, and Abdul Khalik Woodb
                             Physics Department, Faculty of Science,
                                Universiti Teknologi Malaysia,
                  81310 Skudai, Malaysia. email:
                           Analytical Chemistry Application Group,
                       Malaysian Nuclear Agency (Nuclear Malaysia)
                                Bangi, 43000 Kajang, Malaysia

    Neutron activation analysis (NAA) offers excellent sensitivities that are superior to other
analytical techniques in performing identification and quantitative elemental analysis. The
method involves the irradiation of samples and the detection of gamma energies emitted from the
isotopes formed from the process of neutron capture. Most NAA were done by comparison
method, which is found to have high errors due to the differences in the matrix composition of
sample as well as comparator. The purpose of this study is to demonstrate an alternative
technique of activation analysis based on absolute gamma ray measurements and the direct
calculation of elemental concentrations from reaction rates equation of neutron capture process.
The neutron spectrum parameters (f and α), thermal and epithermal neutron flux (φth, φepi,) at 4
rotary rack irradiation positions of the 1-MW Reaktor TRIGA PUSPATI were determined. The
accuracy and precision of this technique were verified by analyzing two standard reference
materials provided by IAEA, ie Soil-1 and Soil-7 at reactor irradiation position 10. The
experimental results obtained for both the materials were found to be in good agreement with the
certified values. Signified by the average z-score for the concentration values were below 2 for
most elements. In conclusion, the proposed technique can be applied for many of our future
activation analyses with high accuracy without having to rely on the availability of comparator
multielement standards.

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