US9638807B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9638807-B2 |
| Application number | US-201313928462-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 27, 2013 |
| Priority date | Aug 7, 2008 |
| Publication date | May 2, 2017 |
| Grant date | May 2, 2017 |
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A host lattice modified GOS scintillating material and a method for using a host lattice modified GOS scintillating material is provided. The host lattice modified GOS scintillating material has a shorter afterglow than conventional GOS scintillating material. In addition, a radiation detector and an imaging device incorporating a host lattice modified GOS scintillating material are provided. A spectral filter may be used in conjunction with the GOS scintillating material.
Opening claim text (preview).
Having thus described the preferred embodiments, the invention is now claimed to be: 1. A scintillating material comprising: a modified GOS material for use with an imaging device, wherein at least about 25% of the gadolinium (Gd) of the GOS material is replaced with at least one of yttrium (Y), lanthanum (La), and lutetium (Lu); and at least one of cerium (Ce) and praseodymium (Pr) as a doping agent. 2. The scintillating material of claim 1 , wherein the doping agent comprises cerium (Ce) having a concentration between 0 and about 50 mole ppm. 3. The scintillating material of claim 1 , wherein the doping agent comprises praseodymium (Pr) having a concentration between about 100 and about 1000 mole ppm. 4. The scintillating material of claim 1 , wherein the doping agent comprises cerium (Ce) having a concentration of about 10 mole ppm and praseodymium (Pr) having a concentration about 700 mole ppm. 5. The scintillating material of claim 1 , wherein at least about 50% of the gadolinium (Gd) is replaced with yttrium (Y) and wherein the doping agent comprises cerium (Ce) and praseodymium (Pr). 6. The scintillating material of claim 1 , wherein at least about 25% and no more than about 75% of the gadolinium (Gd) is replaced with lanthanum (La) and wherein the doping agent comprises cerium (Ce) and praseodymium (Pr). 7. The scintillating material of claim 1 , wherein at least about 25% and no more than about 50% of the gadolinium (Gd) is replaced with lutetium (Lu) and wherein the doping agent comprises cerium (Ce) and praseodymium (Pr). 8. A radiation detector comprising: a modified GOS material, wherein at least about 25% of the gadolinium (Gd) of the GOS material is replaced with at least one of yttrium (Y), lanthanum (La), and lutetium (Lu); and a photomultiplier optically coupled to the modified GOS material. 9. The radiation detector of claim 8 , wherein the radiation detector detects x-rays. 10. The radiation detector of claim 8 , wherein the modified GOS material is a ceramic. 11. The radiation detector of claim 10 , wherein the modified GOS material is a translucent ceramic. 12. The radiation detector of claim 8 , wherein the modified GOS material comprises ytterbium (Yb) impurities. 13. The radiation detector of claim 8 , wherein at least about 25% and no more than about 50% of the gadolinium (Gd) is replaced with lutetium (Lu). 14. The radiation detector of claim 8 , wherein the photomultiplier comprises a cut-off wavelength upper limit of about 800 nm. 15. The radiation detector of claim 8 , further comprising a spectral filter disposed in an optical path between the modified GOS material and the photodetector and adapted to substantially block infrared light emitted from the modified GOS material. 16. A method for detecting radiation comprising the steps of: receiving radiation with a modified GOS material, wherein at least about 25% of the gadolinium (Gd) of the GOS material is replaced with at least one of yttrium (Y), lanthanum (La), and lutetium (Lu), and wherein the modified GOS material comprises at least one of cerium (Ce) and praseodymium (Pr) as a doping agent, and wherein the modified GOS material emits light in response to receiving said radiation; and detecting the light emitted from the modified GOS material with a photodetector. 17. The method of claim 16 , wherein the doping agent comprises cerium (Ce) and praseodymium (Pr). 18. The method of claim 16 , wherein the doping agent comprises cerium (Ce) having a concentration of about 10 mole ppm and praseodymium (Pr) having a concentration about 700 mole ppm. 19. An imaging device comprising: at least one radiation source; and at least one radiation detector comprising: a modified GOS material, wherein at least about 25% of the gadolinium (Gd) of the GOS material is replaced with lutetium (Lu); and a photomultiplier optically coupled to the modified GOS material. 20. The imaging device of claim 19 , wherein the imaging device is a CT, SPECT or PET imaging device. 21. The imaging device of claim 19 , wherein the photomultiplier comprises a cut-off wavelength upper limit of about 800 nm.
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