Let ${\mathrm{\lambda }}_{\mathrm{\alpha }},{\mathrm{\lambda }}_{\mathrm{\beta }}\mathrm{and}{\mathrm{\lambda }}_{\mathrm{\alpha }}^{\text{'}}$ denote the wavelengths of the X-rays of the ${\mathrm{K}}_{\mathrm{\alpha }},{\mathrm{K}}_{\mathrm{\beta }}\mathrm{and}{\mathrm{L}}_{\mathrm{\alpha }}$ lines in the characteristic X-rays for a metal

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