Participation in IAEA proficiency test exercise on major,minor and trace elements in ancient Chinese ceramic (IAEA-CU-2006-06) using low power research reactor |
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Authors: | S Waheed N Siddique J H Zaidi |
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Institution: | (1) Nuclear Chemistry Division, Pakistan Institute of Nuclear Science and Technology, P.O Nilore, Islamabad, 45650, Pakistan |
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Abstract: | A proficiency test (PT) exercise was offered by the International Atomic Energy Agency (IAEA) for major, minor and trace elements
in Chinese ceramic reference material (IAEA-CU-2006-06). Neutron activation analysis (NAA) laboratory at PINSTECH, Pakistan
participated in the exercise and submitted the results for 28 elements. The aim of participation was to develop a suitable
methodology for accurate measurement of as many elements as possible in ceramic material using a low power reactor (PARR-2)
as this would help future investigation in a project on the authenticity of art objects, for provenance, conservation and
management of ancient cultural heritage of the country. After receiving the final report of the PT exercise, a critical review
of our data and final scoring of each element is made to check the suitability of our methodology and reliability of the acquired
data. Most of the reported results passed different statistical evaluation criterion such as relative bias, z-score and u-scores and ratio of our results and IAEA target values. One element (Yb) falls in the unacceptable range of relative bias
and z-scores. Hf and Tb showed slightly high z-scores within the questionable range. Ho, Mo and Sn were determined during this study but their results were not submitted
to the IAEA. The confidence of accuracy observed for most of the elements in ceramic material has made it mandatory to report
their results as information values. |
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