"exposure to x and \u03B3 rays"@en . _:b19822 . . . "exposure to x and gamma rays"@en . _:b19818 _:b19819 . . "exposure (to x and \u03B3 rays)"@en . _:b19822 . "exposure"@en . . _:b19818 . "exposure (to x and gamma rays)"@en . _:b19822 . _:b19819 . _:b19822 . _:b19818 . _:b19819 . _:b19819 . _:b19818 .