Bright yellow SPIDs bearing the familiar red, white, and blue Civil Defense logo became very popular during the Cold War in the United States. com. TLDs for most commercial dosimetric applications are based on crystals of lithium fluoride doped with a small amount of manganese or magnesium, which creates electron traps. Each badge has to be processed at specific times for the safety of the technician using it. For individual monitoring, the photographic films are commonly placed inside suitable holders. The dosimeter measures 8 cm x 4.5 cm x 0.9 cm and weighs 34 grams. Select your institution from the list provided, which will take you to your institution's website to sign in. Application: Film badges. // -->