Standard Curves of the Absorption of Roentgen Rays in Aluminium and Their Employment for Estimating the Equivalent of the Initial Filtration in Roentgen Tubes

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Thoraeus Acta Radiol. XVII, 1936, p. 161.

Behnken Nitka Physikal. Zeitschrift 36, 1935, p. 459.

Wooten Phys. Rev. 13, 1919, p. 71.

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Widmann Amer. Journ. of Roentgenol. and Rad. Ther., Nov. 1935, p. 644.