http://en.wikipedia.org/wiki/X-ray

http://www.answers.com/topic/x-ray

http://science.hq.nasa.gov/kids/imagers/ems/xrays.html

http://www.teamxray.com/

http://www.business.com/directory/industrial_goods_and_services/machinery_and_tools/test_equipment/x-ray/

http://www.radiologyinfo.org/en/info.cfm?PG=bonerad

http://health.howstuffworks.com/x-ray1.htm

http://en.wikipedia.org/wiki/X-ray_machine

http://www.radiologyinfo.org/en/info.cfm?pg=chestrad

http://www.ehow.com/how_2124547_view-xray.html