Investigation of X- and gamma ray photons buildup in some neutron shielding materials using GP fitting approximation

KURUDİREK M., SARDARİ D., KHALEDİ N., ÇAKIR C., Mann K. S.

ANNALS OF NUCLEAR ENERGY, vol.53, pp.485-491, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 53
  • Publication Date: 2013
  • Doi Number: 10.1016/j.anucene.2012.08.002
  • Journal Name: ANNALS OF NUCLEAR ENERGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.485-491
  • Keywords: Neutron shielding materials, Buildup factor, Photon energy, Penetration depth, Effective atomic number, CHEMICAL-COMPOSITION DEPENDENCE, ESSENTIAL AMINO-ACIDS, ENERGY-ABSORPTION, ATTENUATION COEFFICIENTS, PENETRATION DEPTH, CROSS-SECTION, 100 MFP, PROGRESSION, GENERATION, POLYMERS
  • Ataturk University Affiliated: Yes

Abstract

In the present work, the gamma ray energy absorption (EABF) and exposure (EBF) buildup factors have been calculated by using the five parameter geometric progression (GP) fitting formula for some neutron absorbent materials (H3BO3, Na2H4O7, NaCl) and neutron moderator hydrocarbons (C5H12, C6H14, C7H16, C20H42, C40H82) in the energy region 0.015-15 MeV up to a penetration depth of 40 mfp (mean free path). From the results, it has been concluded that the buildup of photons is less in NaCl when compared with other materials for the lower penetration depths (<15 mfp for EABF, <10 mfp for EBF) whereas for photon energies higher than 3 MeV less buildup of secondary gamma rays occur in HC based materials than the other ones at higher penetration depths (>15 mfp for EABF, >10 mfp for EBF). The present results have been compared with MCNP calculations for various energies at 1 mfp and a good correspondance has been obtained. (c) 2012 Elsevier Ltd. All rights reserved.