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In the measurement of ionising radiation the counting efficiency is the ratio between the number of particles or photons counted with a radiation counter and the number of particles or photons of the same type and energy emitted by the radiation source. ==Factors== Several factors affect the counting efficiency: * The distance from the source of radiation * The absorption or scattering particles by the medium (such as air) between the source and the surface of the detector * The detector efficiency in counting all radiation photons and particles that reach the surface of the detector The accompanying diagram shows this graphically. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「counting efficiency」の詳細全文を読む スポンサード リンク
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