GENERAL GUIDANCE ON SHIELDING REQUIREMENTS FOR …
1.5 mm lead; two sheets of barytes board (as above); at least 100 mm of solid concrete; for a viewing window lead glass or lead acrylic with 1.5 mm lead equivalence. Acceptable secondary barrier - mammography room: Less shielding is required because these operate at lower energies. two sheets of gypsum plasterboard, each no less than 9 mm thick ... ................
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