# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (12): 170

### Water equivalence of some 3D dosimeters: a theoretical study based on the effective atomic number and effective fast neutron removal cross section

A. M. El-Khayatt 1,2

1. 1 Department of Physics, College of Science, Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia
2 Reactor Physics Department, NRC, Atomic Energy Authority, Cairo 13759, Egypt
• Contact: A. M. El-Khayatt E-mail:Ahmed_el_khayatt@yahoo.com; aelkhayatt@gmail.com
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A. M. El-Khayatt. Water equivalence of some 3D dosimeters: a theoretical study based on the effective atomic number and effective fast neutron removal cross section.Nuclear Science and Techniques, 2017, 28(12): 170
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Abstract:

Effective atomic numbers for photon energy absorption ( ZPEAeffZPEAeff) and their corresponding electron numbers (NPEAeff)(NPEAeff), and effective macroscopic removal cross sections of fast neutrons (ΣR) were calculated for 27 different types of three-dimensional dosimeters, four types of phantom materials, and water. The values of ZPEAeffZPEAeff and NPEAeffNPEAeff were obtained using the direct method for energies ranging from 10 keV to 20 MeV. Results are presented relative to water, for direct comparison over the range of examined energies. The effect of monomers that are used in polymer gel dosimeters on the water equivalence is discussed. The relation between ΣR and hydrogen content was studied. Micelle gel dosimeters are highly promising because our results demonstrate perfect matching between the effective atomic number, electron density number, and fast neutron attenuation coefficient of water.