A<unk>  <unk>  A<unk> , or<unk> , is a type of radiation<unk> , consisting of a piece of a<unk>  crystalline material inside a radiolucent package. When a<unk>  crystal is exposed to ionizing radiation, it absorbs and traps some of the energy of the radiation in its crystal lattice. When heated, the crystal releases the trapped energy in the form of visible light, the intensity of which is proportional to the intensity of the ionizing radiation the crystal was exposed to. A specialized detector measures the intensity of the emitted light, and this measurement is used to calculate the dose of ionizing radiation the crystal was exposed to. Since the crystal density is similar to human soft tissue density, the dose measurement can be used to calculate absorbed dose. Materials exhibiting<unk> e in response to ionizing radiation include calcium fluoride, lithium fluoride, calcium sulfate, lithium borate, calcium borate, potassium bromide, and feldspar. It was invented in 1954 by Professor Farrington Daniels of the University of Wisconsin-Madison.
Thermoluminescent dosimeter
Gaseous detection device
Dolorimeter
Mercury-in-glass thermometer
Carbon monoxide detector
Whole-body counting
Alcohol thermometer
Keratometer