Scintillation crystal, a radiation detection system including the scintillation crystal, and a method of using the radiation detection system
First Claim
1. A well logging apparatus comprising:
- a scintillation crystal including La(i-y)REyX3;
Me2+, wherein;
RE represents a rare earth element other than La;
y has a value in a range of 0 to 1;
X represents a halogen; and
Me2+ represents Sr, Ba, or any mixture thereof; and
wherein the scintillation crystal has a property including;
for a radiation energy range of 60 keV to 356 keV, the scintillation crystal has an average value for a departure from perfect linearity of no less than −
0.35%;
for a radiation energy range of 2000 keV to 2600 keV, the scintillation crystal has an average value for a departure from perfect linearity of no greater than 0.07%;
for a radiation energy range of 60 keV to 356 keV, the scintillation crystal has an absolute value for a furthest departure from perfect linearity of no greater than 0.7%;
orany combination thereof.
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Accused Products
Abstract
A scintillation crystal can include Ln(1-y)REyX3, wherein Ln represents a rare earth element, RE represents a different rare earth element, y has a value in a range of 0 to 1, and X represents a halogen. In an embodiment, RE is Ce, and the scintillation crystal is doped with Sr, Ba, or a mixture thereof at a concentration of at least approximately 0.0002 wt. %. In another embodiment, the scintillation crystal can have unexpectedly improved linearity and unexpectedly improved energy resolution properties. In a further embodiment, a radiation detection system can include the scintillation crystal, a photosensor, and an electronics device. Such a radiation detection system can be useful in a variety of radiation imaging applications.
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Citations
19 Claims
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1. A well logging apparatus comprising:
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a scintillation crystal including La(i-y)REyX3;
Me2+, wherein;RE represents a rare earth element other than La; y has a value in a range of 0 to 1; X represents a halogen; and Me2+ represents Sr, Ba, or any mixture thereof; and wherein the scintillation crystal has a property including; for a radiation energy range of 60 keV to 356 keV, the scintillation crystal has an average value for a departure from perfect linearity of no less than −
0.35%;for a radiation energy range of 2000 keV to 2600 keV, the scintillation crystal has an average value for a departure from perfect linearity of no greater than 0.07%; for a radiation energy range of 60 keV to 356 keV, the scintillation crystal has an absolute value for a furthest departure from perfect linearity of no greater than 0.7%;
orany combination thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medical imaging apparatus comprising:
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a scintillation crystal including La(1-y)REyX3;
Me2+, wherein;RE represents a rare earth element other than La; y has a value in a range of 0 to 1; X represents a halogen; and Me2+ represents Sr, Ba, or any mixture thereof and has a concentration in a range of 0.0002 wt. % to 0.05 wt. %; a photosensor optically coupled to the scintillation crystal; and an electronics module coupled to the photosensor. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A security inspection apparatus comprising:
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a scintillation crystal including La(1-y)REyX3;
Me2+, wherein;RE represents a rare earth element other than La; y has a value in a range of 0 to 1; X represents a halogen; and Me2+ represents Sr, Ba, or any mixture thereof and has a concentration in a range of 0.0002 wt. % to 0.05 wt. %. - View Dependent Claims (17, 18, 19)
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Specification