Film badge for determining radiation exposure

Film badge for determining radiation exposure

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Radiation monitor. Film badge used to determine a person's exposure to radiation. The badge is worn on a person's clothing and contains a piece of photographic film. Radiation affects the film in a similar way to light. The badge's exterior is of different thicknesses; this allows different areas of the film to be used to measure the exposure to types of radiation which have different penetrating powers. After a period of being worn, the film in the badge is developed. The number of dark areas on it shows how much radiation the person has been exposed to. This system is cheap, easy to operate & reliable, but is slow because of the time needed to process the film.

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Keywords: film badge, photographic film badge, radiation detector, radioactive, radioactivity

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