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With respect to Radiation Protection, injection describes a route by which Radioactive materials may enter the body - thus presenting an Internal Radiation hazard. Injection routes can obviously occur where needles are used to handle or administer radioactive materials, but may also be present where any sharp object is contaminated with radioactive materials which then causes a wound.

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe

– Albert Einstein