Effective atomic numbers of some H-, C-, N- and O-based composite materials derived from differential incoherent scattering cross-sections |
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Authors: | S Prasanna Kumar V Manjunathaguru and T K Umesh |
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Institution: | (1) Lawrence Livermore National Laboratory, Livermore, CA, USA |
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Abstract: | In this work, we have made an effort to determine whether the effective atomic numbers of H-, C-, N- and O-based composite
materials would indeed remain a constant over the energy grid of 280–1200 keV wherein incoherent scattering dominates their
interaction with photons. For this purpose, the differential incoherent scattering cross-sections of Be, C, Mg, Al, Ca and
Ti were measured for three scattering angles 60°, 80° and 100° at 279.1, 661.6 and 1115.5 keV using which an expression for
the effective atomic number was derived. The differential incoherent scattering cross-sections of the composite materials
of interest measured at these three angles in the same set-up and substituted in this expression would yield their effective
atomic number at the three energies. Results obtained in this manner for bakelite, nylon, epoxy, teflon, perspex and some
sugars, fatty acids as well as amino acids agreed to within 2% of some of the other available values. It was also observed
that for each of these samples, Z
eff was almost a constant at the three energies which unambiguously justified the conclusions drawn by other authors earlier
Manjunathaguru and Umesh, J. Phys. B: At. Mol. Opt. Phys.
39, 3969 (2006); Manohara et al,Nucl. Instrum. Methods
B266, 3906 (2008); Manohara et al Phys. Med. Biol.
53, M377 (2008)] based on total interaction cross-sections in the energy grid of interest. |
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