Rare-earth oxysulfide scintillators and X-ray detectors using ra

Details Rare-earth oxysulfide scintillators and X-ray detectors using ra Rare-earth oxysulfide scintillators and X-ray detectors using ra

1996-01-31

1997-06-17

Porta, David P.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

250362, 25036301, 25036302, 25037011, 2504831, G01T 120

Patent

active

056400160

ABSTRACT:
A scintillator is disclosed that comprises a ceramic of a rare-earth oxysulfide activated with Pr, such as Gd.sub.2 O.sub.2 S:Pr, having: (1) a ratio of a peak value at about 270 K to that at about 140 K in a glow curve of about 0.01 or less, when the thermoluminescence intensity of the scintillator is measured at a rate of temperature increase of 15.+-.5 K/min after 20 minutes irradiation with ultraviolet rays having a wavelength of 254 nm and a power of 1 W/m.sup.2 at liquid nitrogen temperature, and (2) a ratio of a peak value at about 630 nm to that at about 512 nm of a thermoluminescence of about 410 K with about 2 nm resolution of about 1 or less.

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