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An '''absorber''' is any material that stops [[ionizing radiation]]. [[Lead]], [[concrete]], and [[steel]] [[attenuation|attenuate]] [[gamma ray]]s. A thin sheet of paper or metal will stop or absorb [[alpha particle]]s and most [[beta particle]]s.<ref>[http://www.lbl.gov/abc/Glossary.html Glossary of Nuclear Terms]</ref>
In a [[photovoltaic]] device, the material that readily absorbs [[photons]] to generate charge carriers (free [[electrons]] or holes).<ref>http://www1.eere.energy.gov/solar/solar_glossary.html</ref>
In a [[photovoltaic]] device, the material that readily absorbs [[photons]] to generate charge carriers (free [[electrons]] or holes).<ref>http://www1.eere.energy.gov/solar/solar_glossary.html</ref>
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[[Category:Batteries]]