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- W2511257856 abstract "The neutron and gamma does for tissue approximation resulting from a 14-MeV neutron source have been calculated as a function of the shielding material and its thickness surrounding the source. The calculations have been carried out for water, concrete, and iron, for thicknesses varying between one and ten mean free paths (mfp). The calculated neutron and gamma spectra emerging from the spherical shielding materials have been compared with measurements for 1.1 to 2.0 mfp of water, 2.1 and 3.9 mfp of concrete and 0.9, 2.9 and 4.8 mfp of iron. These measurements have been carried out using the sphere transmission and time-of-flight techniques. The calculations of the neutron and gamma spectra from the spherical assemblies, as well as the tissue kerma factors (TKF) as a function of emitted energy, have been done using two libraries: the ENDF/B-IV and the ENDL. Differences between the calculated kerma factors are not larger than 6 percent using the two libraries. Comparison of the above kerma factors with earlier values (Henderson, 1959, NBS, 1961) shows differences as large as 20 percent. The tissue gamma dose (TGD) calculations have been done using the values given by NBS, 1961; these values are approximately 10 percent lower thanmore » those given by Henderson.« less" @default.
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- W2511257856 date "1977-04-01" @default.
- W2511257856 modified "2023-10-16" @default.
- W2511257856 title "Radiation doses as a function of the thickness and shielding material surrounding a 14-MeV neutron source" @default.
- W2511257856 hasPublicationYear "1977" @default.
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