= Irradiation
{wiki}
<Irradiation> is exposure of a material or system to <radiation>. The source, <particle flux>, <energy> distribution and duration specify what arrives; the material's interactions determine what is transmitted, scattered or absorbed. Exposure to <light> can excite a <molecule>, whereas sufficiently energetic <ionizing radiation> can remove an <electron> or produce more extensive changes.
Incident <energy> and deposited <energy> are different quantities. A sample can transmit most of an incident beam, so the <absorbed dose> cannot generally be inferred from incident <power> and duration without an absorption model. The same distinction matters when an <irradiation> experiment compares materials with different thicknesses or compositions.
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