[1] T. Sandev. Monte carlo simulation of buildup factors for single and multi-layer shields by using penelope code, Proceedings of the Second Conference on Medical Physics and Biomedical Engineering, Munich, Germany, (2010).
[2] H. Kharrati, A. Agrebi and M.K. Karaoui. Monte carlo simulation of x-ray buildup factors of lead and its applications in shielding of diagnostic x-ray facilities. Med. Phys. 34 (2007) 1398–1404.
[3] M.K. Karoui and H. Kharratia. Monte carlo simulation of photon buildup factors for shielding materials in radiotherapy x-ray facilities. Med. Phys. 40 (2013) 073901–13.
[4] N. Tsoulfanidis. Measurement and detection of radiation. 3rd Edition, Taylor & Francis, (2010).
[5] K. Shina and H. Hirayama. Calculation of gamma-ray buildup factors for two-layered shields made of water, concrete and iron and application of approximating formula. Radiat. Phys. Chem. 61 (2001) 583–584.
[6] L.A. Al-Ani, L.E. Goarge and M.S. Mahdi. Gamma ray buildup factor for finite media in energy range (4-10) MeV for Al and Pb. J. Al-Nahrain University. 18 (2015) 88–95.
[7] P. Deatanyah. Determination of photon ambient dose buildup factors for radiological applications for points and plaque source configurations using MCNP5. Int. J. Sci. Tech. 1 (2011) 174–178.
[8] L. Musilek, T. Cechak and F. Seda. The use of the Monte Carlo method for the calculation of build-up factors in wide conical gamma-radiation beams. Nucl. Instr. Meth. 174 (1980) 565–569.
[9] V.P. Singh and M.N. Badiger. Comprehensive study of energy absorption and exposure build-up factors for concrete shielding in photon energy range 0.015–15 MeV up to 40 mfp penetration depth: dependency of density, chemical elements, photon energy. Int. J. Nucl. Energy. Sci. Tech. 7 (2012) 75–99.
[10] M. Kurudirek. Gamma-ray energy absorption and exposure buildup factor studies in some human tissues with endometriosis. Appl. Radiat. Isot. 69 (2011) 381–388.
[11] S. Singh, A. Kumar, C. Singh, K. Singh Thind and G.S. Mudahar. Effect of finite sample dimensions and total scatter acceptance angle on the gamma ray buildup factor. Ann. Nucl. Energy. 35 (2008) 2414–2416.
[12] C. Garrett and G.N. Whyte. Buildup measurements on cobalt-60 gamma radiation in iron and lead. Phys. Rev. 95 (1954) 889–891.
[13] M.J. Berger and L.V. Spencer. Penetration of gamma rays from isotropic sources through aluminum and concrete, NBS Tech. Note 11 (1959).
[14] J.J. Taylor. Application of gamma ray buildup data to shield design, WAPD-RM-217 (1954).
[15] Y. Harima. An Approximation of Gamma-Ray Buildup Factors by Modified Geometric Progression. Nucl. Sci. Eng. 83 (1986) 299–309.
[16] J.M. Sharaf and H. Saleh. Gamma-ray energy buildup factor calculations and shielding effects of some, Jordanian building structures. Radiat. Phys. Chem. 110 (2015) 87–95.
[17] C. Suteau and M. Chiron. An iterative method for calculating gamma-ray buildup factor in multi-layers shields. Radiat. Prot. Dosimetry. 116 (2005) 489–492.
[18] D. Sandari, A. Abbaspour, S. Baradaran and F. Babapour. Estimation f gamma and X-ray Photon buildup factor in soft tissue with monte carlo method. Appl. Radiat. Isot. 67 (2009) 1438–1440.
[19] J.J. DeMarco and R.E. Wallace, K. Boedeker. An analysis of MCNP cross-sections and tally methods for low-energy photon emitters. Phys. Medicine. Biology. 47 (2002) 1321–27.
[20] J.F. Briesmeister. MCNP- A general Monte Carlo N-particle transport code, version 4C, Los Alamos National Laboratory, LosAlamos, Report No. LA-13709-M, (2000).
[21] H. Hirayama and Y. Harima. Detailed behavior of exposure buildup factor in stratified shields for plane-normal and point isotropic sources, including the effects of bremsstrahlung and fluorescent radiation. Nucl. Sci. Eng. 113 (1993) 367–378.
[22] V.P. Singh and N.M. Badiger. A comprehensivestudy on gamma-ray exposure build-up factors and fast neutron removal cross sections of fly-ashbricks, J. Ceramics. (2013)Article ID 967264.
[23] M.J.R. Aldhuhaibat, M.K. Alfakhar, and M.S. Amana. Numerical buildup factor calculation of gamma rays for single, dual, and multi-layers shields using lead and aluminum. IJRSP. 6 (2015) 5184–5189.
[24] M.S. Al-Arif and D.O. Kakil. Calculated Experimental Model for Multilayer Shield, 3 (2015) 23–27.
[25] M. Kai. Alpha-, Beta- and Gamma-Ray Spectroscopy, Elsevier, (1981).
[26] I. Meric, G.A. Johansen, M.B. Holstad and R.P. Gardner. Nuclear monte carlo modelling of gamma-ray stopping efficiencies of Geiger–Muller counters. Inst. Meth. Phys. Res. A. 636 (2011) 61–66.
[27] D.B. Pelowitz. MCNPX user's manual, Version 2.6, Los Alamos National Laboratory, Los Alamos, (2008).
[28] H. Tavakli-Anbaran, H. Miri-Hakimabad and R. Izadi-Najafabadi. Effects of the detector-collimator on the gamma-rays response function for a NaI(Tl) detector in a constant time of counts. J. App. Sci. 9 (2009) 1550–1555.
[29] L. Geward, N. Guilbert, K. Jensen and H. Levring. WinXCom- a program for calculating X-ray attenuation coefficients. Radiat. Phys. Chem. 71 (2004) 653–654.
[30] J.E. Hoogenboom and D. Legrady. A critical review of the weight window generator in MCNP, American Nuclear Society, on CD-ROM, (2005).
[31] T.E. Booth. MCNP Variance Reduction Examples, Los Alamos National Laboratory, (2005).
[32] U.T. Lin and S.H. Jiang. A dedicated empirical formula for γ-ray buildup factors for a point isotropic source in stratified shields, Radiat. Phys. Chem. 48 (1996) 389–401.
[33] ANSI/ANS, gamma-ray attenuation coefficient and buildup factors for engineering materials. ANSI/ANS-6.4.3-1991. American Nuclear Society, La Grange, (1991).Illinois
[34] A. Shimizu, T. Onda and Y. Sakamoto. Calculationof gamma-ray buildup factors up to depths of 100 mfp by method of invariant embedding (III), J.Nucl. Sci. and Tech, 41 (2004) 413–424.
[35] B. Oto, S.E. Gulebaglanand G.S. Kanberoglu. Thecalculation of some gamma shielding parametersfor semiconductor CsPbBr3, J. Appl. Phys. 1815 (2017) 130008 (1-4).
[36] M. Dong, B.O. Elbashir and M.I. Sayyed. Enhancement of gamma ray shielding properties by PbO partial replacement of WO3 in ternary 60TeO2–(40-x)WO3–xPbO glass system, Chalcogenide Lett. 14 (2017) 113–118.
[37] V.P. Singh, N.M. Badiger and N. Kucuk. Assessment of methods for estimation of effective atomic numbers of common human organ and tissue substitutes: waxes, plastics and polymers, Radioprotection, 49 (2014) 115–121.
[38] P. Kaur, D. Singh and T. Singh. Heavy metal oxide glasses as gamma rays shielding material, Nucl. Eng. Des. 307 (2016) 364–376.