Scintillator with ZnWO.sub.4 single crystal
AssigneeHitachi, Ltd.
InventorsTetsu Oi, Kazumasa Takagi, Tokuumi Fukazawa
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Abstract
A scintillator formed of a ZnWO.sub.4 single crystal having an absorption coefficient less than or equal to 1.8 cm.sup.-1 for the light having a wavelength of 520 nm is disclosed which has a luminescence wavelength of 480 nm and therefore can be combined with a photodiode, and which is high in radiation detection sensitivity, short in decay time, and specifically suitable for use in computed tomography.
Claims14
A scintillator having a zinc-tungstate single crystal as the scintillating material, said zinc-tungstate single crystal having an impurity content of not more than 50 ppm.
A scintillation counter adapted for counting incident X-rays, comprising:
- a housing having a window for receiving incident X-rays;
- a scintillator crystal formed of a zinc tungstate single crystal having an impurity content of not more than 50 ppm and a thickness of 2 to 4 mm and disposed in said housing adjacent to said window for receiving incident X-rays and emitting light rays of a maximum luminescence wavelength of 480 nm;
- and
- a photo-detector disposed adjacent to the rear surface of said scintillator crystal in the housing for detecting the light rays emitted from the scintillator crystal, thereby detecting the incident X-rays.
In a scintillation counter for use in computed tomography using white X-rays, including a scintillator member for receiving the X-rays and emitting light rays, and a photo-detector for receiving and detecting the light rays emitted from the scintillator member, the improvement comprising:
- said scintillator member being formed of a single crystal zinc tungstate containing an impurity content of not more than 50 ppm and having a thickness of 2 to 4 mm.
Dependencies are inferred from the claim text.