2006-08-27 05:37:46 · 2 answers · asked by Camille L 1 in Science & Mathematics ➔ Physics
A fluorescent sheet is used together with the film to enhance X ray
effect on film , it converts X rays to light and so you need 30 times less radiation for exposure .In dental radiography such fluorescent sheets are not used .
2006-08-27 07:47:04 · answer #1 · answered by faramarz f 2 · 0⤊ 0⤋
Due to fluorescent? Huh? If you're referring to *fluoresence* then no, since fluoresence causes things to glow, not appear dark. If by film you mean a photgraphic negative then they're dark because that's how film works: the chemicals turn dark when light hits them, so the image is a negative version of the real image. Film that has not been exposed is white or transparent. Your question is really unclear.
2006-08-27 06:16:16 · answer #2 · answered by AmigaJoe 3 · 0⤊ 0⤋