File:US Navy 040101-N-9742R-002 Machinist's Mate 2nd Class Stan Proctor from Crofton, Md., inserts the calcium-fluoride crystal from a Thermal-Luminescent Dosimeter (TLD).jpg

English: Arabian Gulf (Jan. 1, 2004) -- Machinist's Mate 2nd Class Stan Proctor from Crofton, Md., inserts the calcium-fluoride crystal from a Thermal-Luminescent Dosimeter (TLD) into a TLD reader to record radiation exposure levels. TLDs are carried by approximately 1,200 Engineering and Reactor Department personnel aboard the nuclear-powered aircraft carrier USS Enterprise (CVN 65), and measure exposure to radiation and the level of exposure of each TLD. Each TLD must be recorded monthly by the Reactor Laboratories division. The Enterprise Carrier Strike Group (CSG) is currently deployed conducting missions in support of Operation Iraqi Freedom and the continued war on terrorism. U.S. Navy photo by Photographer's Mate Airman Milosz Reterski. (RELEASED)