Absorption of X-rays by Lead Glasses and Lead Barium Glasses

THE results of a study of the protective properties of a group of typical flint and barium-flint glasses are reported. In chemical composition, the protective glasses analyzed were found to resemble closely the denser optical flint and barium-flint glasses. The protection coefficients of the glasses were determined by an ionization method; of the various component elements it was found that only lead and barium contribute appreciably to the protective effectiveness of the glasses. For flint glass empirical relations were established between the protection coefficient and the chemical composition, density, and refractivity; for barium-flint glass an empirical relation is given between the protection coefficient and the lead-oxide and barium-oxide components of the glass.