X-ray fluorescent screen, x-ray detector, and x-ray inspection device using same
AssigneesKabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
InventorsEiji OYAIZU, Makoto HAYASHI
Life of this patent
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Abstract
According to one embodiment, a fluorescent screen configured to convert X-rays to visible light and including a first layer, a second layer and a third layer provided between the first layer and the second layer and containing a phosphor. The phosphor is formed of europium-activated barium fluorochloride. A weight of the phosphor is greater than or equal to 300 mg/cm2 and less than or equal to 600 mg/cm2. A total light transmittance of each of the first layer and the second layer for an emission wavelength 380 nm of the phosphor is greater than or equal to 70%.
Claims18
A fluorescent screen configured to convert X-rays to visible light, comprising:
- a first layer;
- a second layer;
- and
- a third layer provided between the first layer and the second layer and containing a phosphor, wherein
- the phosphor is formed of europium-activated barium fluorochloride,
- a weight of the phosphor in the third layer is greater than or equal to 300 mg/cm2 and less than or equal to 600 mg/cm2, and
- a total light transmittance of each of the first layer and the second layer for an emission wavelength 380 nm of the phosphor is greater than or equal to 70%.
An X-ray detector comprising:
- a detector body comprising an incident portion of X-rays;
- a fluorescence generation means comprising a fluorescent screen which is provided in the incident portion, is configured to convert X-rays to visible light and comprises:
- a first layer;
- a second layer;
- and
- a third layer provided between the first layer and the second layer and containing a phosphor, wherein
- the phosphor is formed of europium-activated barium fluorochloride, and a weight of the phosphor in the third layer is greater than or equal to 300 mg/cm2 and less than or equal to 600 mg/cm2, and a total light transmittance of each of the first layer and the second layer for an emission wavelength 380 nm of the phosphor is greater than or equal to 70%;
- and
- a photoelectric conversion means provided in the detector body.
An X-ray inspection device comprising:
- an X-ray irradiation means which irradiates a target object with X-rays;
- a detector body comprising an incident portion of X-rays;
- a fluorescence generation means comprising a fluorescent screen which is provided in the incident portion, is configured to convert X-rays to visible light, and comprises:
- a first layer;
- a second layer;
- and
- a third layer provided between the first layer and the second layer and containing a phosphor, wherein
- the phosphor is formed of europium-activated barium fluorochloride, and a weight of the phosphor in the third layer is greater than or equal to 300 mg/cm2 and less than or equal to 600 mg/cm2, and a total light transmittance of each of the first layer and the second layer for an emission wavelength 380 nm of the phosphor is greater than or equal to 70%;
- an X-ray detection means which comprises an X-ray detector comprising a photoelectric conversion means provided in the detector body, and detects transmissive X-rays or Compton scattering X-rays from the target object;
- and
- a means for creating an image of inside of the target object based on an X-ray strength measured by the X-ray detection means.
Dependencies are inferred from the claim text.