California Code, Labor Code - LAB § 6306

(a) “Safe,” “safety,” and “health” as applied to an employment or a place of employment mean such freedom from danger to the life, safety, or health of employees as the nature of the employment reasonably permits.

(b) “Safety device” and “safeguard” shall be given a broad interpretation so as to include any practicable method of mitigating or preventing a specific danger, including the danger of exposure to potentially injurious levels of ionizing radiation or potentially injurious quantities of radioactive materials.