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Effect of the new photoatomic data library EPDL2017 to mass attenuation coefficient calculation of materials used in the nuclear medicine facilities using EpiXS software

  • Jecong, J.F.M. (Department of Science and Technology - Philippine Nuclear Research Institute (DOST-PNRI)) ;
  • Hila, F.C. (Department of Science and Technology - Philippine Nuclear Research Institute (DOST-PNRI)) ;
  • Balderas, C.V. (Department of Science and Technology - Philippine Nuclear Research Institute (DOST-PNRI)) ;
  • Guillermo, N.R.D. (Department of Science and Technology - Philippine Nuclear Research Institute (DOST-PNRI))
  • 투고 : 2021.04.15
  • 심사 : 2022.03.22
  • 발행 : 2022.09.25

초록

The accuracy of the photoatomic cross-section data is of great importance in the field of radiation protection, particularly in the characterization of radiation shielding materials. With the release of the latest and probably the most accurate photoatomic data library, EPDL2017, the need to re-evaluate all the existing and already established mass attenuation coefficients (MACs) of all radiation shielding materials arises. The MACs of several polymers, alloy-based, glasses, and building materials used in a nuclear medicine facility were investigated using the EPDL2017 library embedded in EpiXS software and were compared to MACs available in the literature. The relative differences between MACEpiXS and MACXCOM were negligible, ranging from 0.02% to 0.36% for most materials. However, for material like a glass comprising of elements Te and La evaluated near their corresponding K-edge energies, the relative differences in MACs increased up to 1.46%. On the other hand, a comparison with MACs calculated based on EPDL97 (a predecessor of EPDL2017) revealed as much as a 6.61% difference. Also, it would seem that the changes in MACs were more evident in the materials composed of high atomic number elements evaluated at x-ray energies compared to materials composed of low atomic number elements evaluated at gamma-ray energies.

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