Calculation of Energy Dissipation by Gamma Radiation near the Interface between Two Media
1.M. A. Van Dilla and G. J. Hine, Nucleonics 10, No. 7, 54 (1952).
2.F. H. Attix and V. H. Ritz, J. Research Natl. Bur. Standards, 5, 293 (1957).
3.B. W. Soole, Proc. Roy. Soc. (London) A230, 343 (1955).
4.W. F. Titus (to be published).
5.L. V. Spencer and U. Fano, J. Research Natl. Bur. Standards 46, 446 (1951).
6.H. Goldstein and J. E. Wilkins, Jr., AEC Rept. NYO 3075 (1954).
7.Within the present schematization the absolute value of the density does not matter, as long as medium No. 2 is much denser than medium No. 1.
8.Absorption is treated analytically and is not allowed to terminate a photon history. Instead, an artificial cutoff is used which is discussed in Sec. 4.2.
9.In the numerical computations whose results are reported in Sec. 5, the density ratio was set equal to zero. This approximation is accurate enough for application to the combination air/ground, and even for the combination steel‐wool/steel used in the experiment of Titus.4
10.M. J. Berger, J. Research Natl. Bur. Standards 55, 343 (1955).
10.The energy sampling scheme of this reference was replaced by a rejection technique due to H. Kahn [AEC Report RM‐1237 (April 19, 1954)].
11.Numerical experiments were also done with sources emitting photons in specific directions, with subsequent averaging over different sources to obtain solutions for an isotropic source. Such a procedure can in principle provide more information, but was found to result in increased sampling fluctuations and was therefore abandoned.
12.A more detailed calculation by the methods of references 5 and 6 indicates that the correct value of the neglected fraction is more nearly 0.037.
13.A small correction was applied to the Monte Carlo results to include the neglected 3.7% of the input energy. This was done with the use of the spatial distributions of the flux components below obtained from the tabulations of reference 6.
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