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{{Short description|Penetrating form of electromagnetic radiation}} ...atter]]; in 1900, he had already named two less penetrating types of decay radiation (discovered by [[Henri Becquerel]]) [[alpha rays]] and [[beta rays]] in asc ...

...e [[radioactivity]] (APR). In more recent times they may also be used to [[Radiation monitoring|monitor]] people in their homes for the presence of manmade radi ...he air through a sample chamber volume which is viewed continuously by a [[radiation detector]]. [[Radionuclide]]s that occur in the gaseous form (e.g., <sup>85 ...