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輻射出射度（radiant exitance），簡稱輻出度，舊稱輻射發射率（radiant emittance），是表示輻射功率密度的物理量，定義為離開表面一點處的面元的輻射能通量除以該面元面積[1]，單位為瓦特每平方米。
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