Excerpt from Manuel de Radioscopie Et de Radiographie par l'Emploi des Rayons X

Disons tout de suite la difference apparente qu'il y a entre la fluorescence et la phosphorescence, termes qui peuvent sembler identiques ou similaires dans l'esprit. La fluorescence cesse immediatement avec la cause qui la produit; la phos phorescence persiste alors que la cause productrice est de truite.

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