Patent Number: 6,515,286

Title: Solid-state radiation detector in which signal charges are reduced belowsaturation level

Abstract: In a radiation detector: a CsI:Tl (or CsI:Na) scintillator receives anumber X of radiation quantums for each pixel, and emits a number L ofphotons constituting fluorescent light in response to each radiationquantum; photoelectric converters containing Si (or Se) as a maincomponent are arranged corresponding to respective pixels to receive thefluorescent light with an entrance efficiency T, and generate charges whenthe fluorescent light is detected; and a capacitor is connected to eachphotoelectric converter, and stores the charges generated by thephotoelectric converter. When the radiation detector receives a 10 to 300mR dose of the radiation, the numbers X and L, the entrance efficiency T,the fill factor F and the photoelectric conversion efficiency .eta. ofeach photoelectric converter, and the maximum storable charge amount Q ofthe capacitor satisfy a relationshipX.multidot.L.multidot.T.multidot.F.multidot..eta..ltoreq.Q.

Inventors: Kuwabara; Takao (Kaisei-machi, JP)


International Classification: G01T 1/00 (20060101); G01T 1/20 (20060101); G01T 1/29 (20060101); H01L 027/00 ()

Expiration Date: 02/02015