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Dependence of NaI(Tl) detector intrinsic efficiency on source-detector distance, energy and off-axis distance: Their implications for radioactivity measurements

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Abstract

In this work the dependence of intrinsic efficiency of a NaI(Tl) detector of radius 3.82 cm and height 7.62 cm on source-detector distance (d), source-off-axis distance (d 0) and γ-photon energy have been investigated using analytical and Monte Carlo methods. The results showed that, for a given off-axis distance, there exists a value of the ratio of source-detector distance (d) to detector radius (R) where intrinsic efficiency is minimum. This d/R value at which minimum efficiency occurs approaches zero as off-axis distance increases and it is almost constant with increase in energy. In the region where d/R < 0.01, a criteria given by Jehouani et al [1] for good photon detection, intrinsic efficiency decreases with increasing off-axis distance. The implications of the results for radioactivity measurement and radiation protection are discussed. Chacteristics of intrinsic efficiency in the regions d/R < 0.01 and d/R > 10 are also compared.

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Authors and Affiliations

  1. Department of Physics, University of Ibadan, Ibadan, Nigeria

    F. O. Ogundare

  2. Department of Physics and Electronics, Adekunle Ajasin University, Akungba-Akoko, Ondo State, Nigeria

    E. O. Oniya

  3. Centre for Energy Research and Development, Obafemi Awolowo University, Ile-Ife, Nigeria

    F. A. Balogun

Authors
  1. F. O. Ogundare
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  2. E. O. Oniya
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  3. F. A. Balogun
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Correspondence to F. O. Ogundare.

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Ogundare, F.O., Oniya, E.O. & Balogun, F.A. Dependence of NaI(Tl) detector intrinsic efficiency on source-detector distance, energy and off-axis distance: Their implications for radioactivity measurements. Pramana - J Phys 70, 863–874 (2008). https://doi.org/10.1007/s12043-008-0095-z

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  • DOI: https://doi.org/10.1007/s12043-008-0095-z

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