THERMO LUMINESCENCE DOSIMETRY OF SOME NATURAL MINERAL SAMPLES
THERMO LUMINESCENCE DOSIMETRY OF SOME NATURAL MINERAL SAMPLES
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Date
1994-09
Authors
ABAFONI, Jackson Jockthan
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Abstract
Natural mineral compounds of geologic origin usually contain diverse kinds of impurities, mechanical defects and imperfections lying in their forbidden energy levels. Some of these exhibit thermoluminescence (TL) characteristics when exposed to ionising radiation and heated at constant rate.
Natural minerals obtained locally (here in Nigeria) were ground into powder and thermoluminescence dosimetry properties were studied through artificial irradiation of
the samples using Sr 9°-Y9 o B source at different dose levels. Using the Solaro Model 680 TLD reader, TL corresponding to a particular radiation dose can be
obtained. The TL properties studied are based on the proposals for the International standards for TLDs. Tests required by international Atomic Energy Agency (IAEA) which are fading rate, dose versus response linearity, effect of ambient light and stability of dosemeters under standard
climatic condition, and tests required by the International Electrotechnical Commission (IEC) which include batch
homogeneity, detection threshold, stability of zero point, repeatability and residual TL, have been investigated. The results obtained in this work are in partial
agreement with the recommendations for the international standards for TLDs. Suggestions therefore, have been made on
how to improve upon this present research in order to achieve the desired goal of producing dosimetric phosphors for use in various fields of radiation detection and
measurements.
Description
A thesis submitted to the School of Postgraduate Studies, Ahmadu Bello University, Zaria, in partial fulfilment of the requirement for the award of the degree of Master of Science (M.Sc.) PHYSICS.,
Keywords
THERMO, LUMINESCENCE, DOSIMETRY, NATURAL, MINERA, SAMPLES