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Endovascular: A tiny cut, about the size of a pencil eraser, made by an interventional radiologist through which catheters or wires are put into blood vessels. This is a procedure that doesn't do much damage. The catheter or wire is then guided to the right place so that treatments can be done using ultrasound or fluoroscopy.. Fallout, nuclear: Small pieces of radioactive debris slowly fall from the sky after an atomic bomb goes off. Fissile material: any substance that can break up when neutrons hit it. The three most important fissile materials are uranium-233, uranium-235, and plutonium-239. Fission: A lot of energy is given off when a nucleus splits into at least two other nuclei. Usually, two or three neutrons are released during this change. Embolization: A way to stop flow by putting something into a blood vessel or other structure. These things could be slurries of gel foam, metal coils, beads, or glue. Fluoroscopy: Interventional radiologists can help guide minimally invasive proce
