# Calculated-Experimental Model for Multilayer Shield

### Abstract

The effective linear attenuation coefficients and build-up factors for single shield of Al, Fe, Pb, and for multi-layer shield of Al-Pb, Al-Fe, Fe-Pb, Al-Fe-Pb as a function of shield thickness, atomic number, and order of the materials composing the shield are investigated for two photon energies of 0.662 MeV and 1.25 MeV. Two derived practical formulas to calculate the effective attenuation coefficient and build-up factor for multilayer shields are used. It is noticed that changing the order of the materials among the shield has no significant effect on the experimental result. Measurement agrees well with the trend of the suggested formulas for calculating the effective attenuation coefficient and the buildup factor. The linear attenuation coefficient is observed to have a strange dependency with the atomic number and photon energy. For single layer shield, the attenuation coefficient increases with decreasing atomic number at low photon energy and increasing with increasing atomic number at high photon energy.### Downloads

### References

Al-Baiti, K.O., 2010. Calculation of Dose Gamma Ray Buildup Factor up to Thickness of 20 mfp using Taylor's Method. Journal of Kufa University- Physics, (2)2, pp.33-41.

Alamatsaz, M.H. and Shirani, A., 2002. A study of gamma exposure buildup factors in stratified shields for point isotropic sources, including the effectives of incoherent and coherent scattering. Journal of science, Islamic republic of Iran, (3)13, pp.271-279.

Abdulfattah, A.A., 2010. Effect of exposure buildup factors on reactor shielding. Journal of Al-Nahrain University, (1)13, pp.78-83.

Balwinder, S., Vipan, K., Sukhwinder, S., Gurdeep, S.S., 2013. Investigations of mass attenuation coefficient and energy absorption buildup factor of some low-Z gamma ray shielding materials. International Journal of Latest Research in Science and Technology, (5)2, pp.73-77.

Hubbel, J.H. and Berger, M.J., 1987. Photon cross sections, attenuation coefficients, and energy absorption coefficients from 10 keV to 100 MeV. National Bureau of Standards report NSRDS-NSB29, pp.3597-3598.

Hubbell, J.H. and Seltzer, S. M., 1996. Tables of X-Ray Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients from 1 keV to 20 MeV for Elements Z = 1 to 92 and 48 Additional Substances of dosimetric interest. Radiation and Biomolecular Physics Division, PML, NIST.

Jasbir, S.D., Barjinderpal S. and Gurdeep S.S., 2012. Gamma Ray Photon Energy Absorption Buildup Factor Study In Some Soils. IOSR Journal of Applied Physics (IOSRJAP), (6)1, pp.14-21.

Shin, K. and Hirayama, H., 2001. Calculation of gamma-ray buildup factors for two-layered shields made of water, concrete and iron and application of approximating formula. Radiation Physics and Chemistry, 61(3), pp.583–584.

Nelson, W.R., Hirayama, H. and Rogers, D.W.O, 1985. "The EGS4 code system" SLAC-265, Stanford Linear Accelerator Center, Stanford, California.

Saudi, H. A., 2013. Lead Phosphate Glass containing Boron and Lithium Oxides as a shielding material for Neutron and Gamma Radiation. Applied Mathematics and Physics, (4)1, pp.143-146.

*ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY*, 3(1), pp. 23-27. doi: 10.14500/aro.10057.

Copyright (c) 2016 Maan S. Al-Arif, Diyaree O. Kakil

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