Non-destructive profiling of fluorine in teeth to large depths |
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Authors: | M A Chaudhri M N Chaudhri Q Nadeem Q Jabbar |
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Institution: | (1) Pakistan Council of Scientific and Industrial Research, Laboratories Complex, Lahore, Pakistan;(2) Institute of Medical Physics, Klinikum-Nürnberg-Süd, 90471 Nürnberg, Germany;(3) Physics Department, Lahore College for Women, Lahore, Pakistan |
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Abstract: | A new method for non-destructive depth profiling of fluorine has been developed which extends the profiling range to much
larger depths than hitherto possible. In this method the thick-target yield of 6–7 MeV gammas from the reaction of 19F(p,αγ) 16O in the tooth sample, was measured as a function of the incident energy from threshold to up to 2.7 MeV and the yield curve
plotted. This curve was compared to the calculated yield curve of 6–7 MeV gammas from the same reaction but on an enamel matrix
containing uniformly distributed fluorine. The difference in the shape of the two curves was only due to the non-uniform distribution
of fluorine in the tooth sample, which could then be calculated. By making use of this method F-depth profiles in teeth of
monkeys were determined non-destructively to a depth of 14 μm. This method is also applicable for profiling other elements
through appropriate resonant or non-resonant nuclear reactions. |
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