The X-ray occurs in a special room with a movable X-ray camera attached to a large metal arm. You will stand next to a "plate." This plate may contain X-ray film or a special sensor that records the images on a computer. You'll wear a lead apron to cover your genitals. This is because your sperm (men) and eggs (women) could be damaged from the radiation. The X-ray technician will tell you how to stand and will record both front and side views of your chest. While the images are taken, you'll need to hold your breath so that your chest stays completely still. If you move, the images might turn out blurry. As the radiation passes through your body and onto the plate, denser materials, such as bone and the muscles of your heart, will appear white.After the images have been captured - which should take 20 minutes or so - your part is complete. You can change back into your clothes and go about year day.