![]() The clear parts of the image are bones and/or things the X-raysĬouldn't get through, the clear film remains clear, and the black part The parts of the silver metal on the film that will be darkened, will be darkened mostly by light, and partly by xrays, since there's more light than xrays hitting it. In addition to flurescent material, there is also phosphorescent material, it has phosphorescent phosphurs,which keeps the light stored for some time. Wikipedia says most fluorescent material converts that way, high energy to low energy. It takes the high energy photons/short wavelength waves and absorbs it and emits lower energy photons/longer wavelength waves/visible light. For example some "invisible ink" is florescent, it lights up when UV light is shone on it. It seems that technically, most of the rays hitting the silver are light, because in order to require less dosage of radiation, the scientists thought of using a fluorescent material, the xrays pass through that and the fluorescent material converts the xrays into visible light, it absorbs the xrays and emits visible light.įluorescent material does that(material with fluorescent phosphors). The silver can be blackened by xrays or light. The film is covered in a kind of silver particles, silver halide. tumours), the clear parts of film remain clear,Īnd the black parts is where the xrays hit The CLEAR parts of the image are bones and/or things the X-rays couldn't get through (e.g. The ones for black and white photos, and for xrays, may be grey i've seen amber transparent colour film (that's the case with colour films used by photographers, and may or may not be the case with a photographers films for black and white photos, and the films used in xrays). The X-rays themselves, the clear film, and an object/person in-betweenĪpparently clear/transparent film may come in a few background colours can be grey, can be purple, can be amber. X-rays themselves, the white film, and an object/person in-between. But it's clear and black.Īnd re what makes the film go black, the film itself doesn't, but the exposed silver on it does. Because the clear part of the xray takes the colour of the background the xray image is on. If they were on a purple background then they'd show up as black and purple (purple bones). white table or white wall, they show as white and black. I understand that X-ray images are black and white. Michael's answer is very good, i'll just simplify Normal B&W film is actually slightly sensitive to x-rays but, the emulsion of dedicated x-ray film contains other components to facilitate the silver reduction from x-ray exposure. X-ray films are typically viewed on an illuminated white background, making the unexposed areas appear white (or off-white, coloured by the plastic base). It's basically a transparent plastic base coated with an emulsion of silver halide particles (a salt of $\ce$) block light passing through the film and the unexposed regions are transparent, taking on the colour of the plastic base (often blue or grey). X-ray film is very similar to standard black and white negative film. In black and white photography, was it a black photographic film that went white when exposed to light? I have seen old-fashioned camera film before. What is the white photographic film made from that distinguishes it from a black photographic film? Can I buy white photographic film? I understand that X-ray machines used to use a white photographic film. But I want to understand at least how the traditional ones are black and white. I understand they don't work like that anymore and now you can have other types of X-ray detection mechanisms. The X-rays hit the fluorescent material and (I guess by absorption and reflection, or absorption and emission) converts it into regular light, and there is a phosphorescent material/coating there, too, so the light remains for a while, and the light, I guess, blackens the film. I've also heard that they have a cassette/casing, and in that is fluorescent material or coating and film. ![]() The white parts of the image are bones and/or things the X-rays couldn't get through, the white film remains white, and the black part is where the X-rays did pass through, and it blackens the white film. You have the X-rays themselves, the white film, and an object/person in-between. I read on a bbc gcse bitesize webpage "In older X-ray machines, white photographic film"
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