Selection of energy in gamma absorption method of layer thickness measurements in two-layered components
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Empirical formulas relating optimal energies at which the weighted average error in gamma-absorption thickness measurements of two-layered structures to the thicknesses of each layer over the range of 30 to 150 mm in terms of carbon have been suggested. The error in approximations of the informative parameter based on tables is within 10% when the error in the layer thickness is no higher than 2.5%. Calculations for some specific cases are given. Practical recommendations on applications of these results are given. On the base of the concept of a “broad optimum,” a generalizing equation relating basic parameters of the problem and allowing one to easily select optimal energies with an error sufficiently small for practical needs (no higher than 6% in the estimate of the weighted average of layer thickness measurements) has been derived.
KeywordsLayer Thickness Atomic Number Nondestructive Test Optimal Energy Approximation Factor
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- 1.Winiger, S. and Wellington, J., Application of Tomography to Investigation of Three-Phase Flows,Rev. Sci. Instr., 1987, vol. 58, no. 1, pp. 55–56.Google Scholar
- 2.Nedavnii, O.I. and Osipov, S.P., Gamma-Absorption Identification of Analyzed Materials,Defektoskopiya, 1996, no. 4, pp. 50–54.Google Scholar
- 3.Nedavnii, O.I. and Osipov, S.P., Technique for Measuring Concentrations in Three-Component Mixtures by the Gamma-Absorption Method,Zavodskaya laboratoriya, 1994, no. 12, pp. 15–18.Google Scholar
- 4.Nedavnii, O.I., Osipov, S.P., and Sidulenko, O.A., Assessment of Possibilities of Gamma-Absorption Measurements of Layer Thicknesses in Multilayered Structures,Defektoskopiya, 1995, no. 11, pp. 74–81.Google Scholar
- 5.Nemets, O.F. and Gofman, Yu.V.,Spravochnik po yadernoi fizike (Handbook on Nuclear Physics), Kiev: Naukova Dumka, 1975.Google Scholar
- 6.Zabrodskii, V.A.,Primenenie obratnorasseyannogo, izlucheniya v promyshlennosti (Industrial Applications of Backscattered Radiation), Moscow: Energoatomizdat, 1989.Google Scholar
- 7.Pokrovskii, A. V. and Ripp, A.G., Selection of Energy and Intensity of a Source for Radioactive-Isotope NDT,Defektoskopiya, 1971, no. 2, pp. 108–111.Google Scholar
- 8.Forsythe, G., Malcolm, M., and Moler, C., Computer Methods for Mathematical Computations, Englewood Cliffs: Prentice-Hall, 1977 Translated into Russian under the titleMashinnye metody matematicheskikh vychislenii, Moscow: Mir, 1980.Google Scholar