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hazard symbol ionizing radiation symbol the international radiation symbol also known as the trefoil first appeared in 1946 at the university of california berkeley radiation laboratory at the time it was rendered as magenta and was set on a blue background history of the radiation warning symbol it was only in 1948 that the symbol came under consideration for wider use when brookhaven national laboratory doe new york requested a “standardised symbol of standardised colours” for use in their radiation safety programme
 

cardinal principles of radiation protection ce essentials objectives upon pletion the reader will be able to list and discuss the three cardinal principles of radiation protection state how the primary fluoroscopist can limit exposure time to patients and others during dynamic imaging procedures number sign the symbol is most monly known as the number sign hash or pound sign the symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois having been derived from the now rare ℔ number symbolism history meaning & facts number symbolism cultural associations—including religious philosophic and aesthetic—with various numbers humanity has had a love hate relationship with numbers from the earliest times


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