Identify the safety device on a needle to protect users from accidental needle injury

The radiation that is least dangerous as a threat to external portions of the body but is very dangerous if ingested or inhaled is:

a. Alpha b. Ultra violet c. Electromagnetic d. Gamma

Which route(s) of drug administration undergoes significant enterohepatic circulation?

a. oral b. intravenous c. intramuscular d. subcutaneous