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In high energy physics experiments, an absorber is a block of material used to absorb some of the energy of an incident particle. Absorbers can be made of a variety of materials, depending on the purpose; lead, tungsten and liquid hydrogen are common choices. Most absorbers are used as part of a particle detector, particle accelerators use absorbers to reduce the radiation damage on accelerator components.
A more recent use for absorbers is for ionization cooling, as in the International Muon Ionization Cooling Experiment.
In solar power, the most important part of the collector takes up the heat of the solar radiation through a medium (water + antifreeze). This is heated and circulates between the collector and the storage tank. A high degree of efficiency is achieved by using black absorbers or, even better, through selective coating.
In sunscreen, ingredients which absorb UVA/UVB rays, such as avobenzone and octyl methoxycinnamate, are known as absorbers. They are contrasted with physical "blockers" of UV radiation such as titanium dioxide and zinc oxide.
References
- "Slide 1" (PDF). Physics.utoronoto.ca. Retrieved 2016-12-23.
- E.H. Hoyer; W.C. Turner; N.V. Mokhov. "ABSORBERS FOR THE HIGH LUMINOSITY INSERTIONS OF THE LHC" (PDF). Accelconf.web.cern.ch. Retrieved 2016-12-23.
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