To provide an improved radiation image storage panel having high photosensitivity and stability against yellowing and/or hydrolysis by specifying contained phosphorescent material.
Phosphorescent material is compound phosphorescent material having a first part with one phosphorescent material composition and a second part with another different phosphorescent material composition, and has a luminous layer containing a mass of phosphorescent material grains. Each phosphorescent material grain has the first part and the second part. The second part is on the outside of the first part and is connected to the first part. The first part contain first phosphorescent material containing the combination of chemical species characterized by a relational expression: MFX1-zIz.uMaXa: yA:eJ:tD. The second part contains second phosphorescent material containing the combination of chemical species characterized by a relational expression: M'F'X'1-z+qI'z-q.u'Ma↑'Xa↑': y'A':e'J':t'D'.
KAIRU YUUJIIN SUMISU
PATORITSUKU MADOTSUKU RANBAATO
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