X-rays are electromagnetic radiation of the same nature as visible light but with only l/1000th the wavelength.(1) X-rays behave like light toward photosensitive materials. For example, when a dentist takes a radiograph he places an unexposed photosensitive film next to the teeth and turns on the x-rays. Cavities show up dark on the negative film because they transmit x-rays so well. Sound teeth show up less dark because they are denser than air or flesh. Ceramic and plastic fillings are still darker if they are denser than teeth and bone: Silver and gold show up very dark when exposed to x-rays because they are very dense (of high atomic number).
KeywordsHigh Atomic Number Pole Piece Pellet Diameter Photosensitive Material Sound Tooth
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