METHOD OF PRODUCING GdOS:Pr WITH VERY SHORT AFTERGLOW FOR COMPUTER TOMOGRAPHY Russian patent published in 2011 - IPC C09K11/84 G01T1/24 C04B35/50 

FIELD: chemistry.

SUBSTANCE: fluorescent ceramic material Gd₂O₂S:Pr with very short afterglow contains ≤1 million parts by weight europium from Gd₂O₂S, and from ≥0.1 to ≤100 million parts by weight cerium from Gd₂O₂S, where content of cerium is higher than content of europium with ratio of europium to cerium between 1:10 and 1:150. To obtain fluorescent ceramic material, powder with particle size of 1-20 mcm is used and hot pressing is carried out in one direction at temperature 1000-1400°C and/or pressure of 100-300 MPa. The material is then annealed in air at temperature 700-1200°C for 0.5-30 hours. Before annealing in air, the material can be annealed in a vacuum at temperature 1000-1400°C for 0.5-30 hours. The obtained material is characterised by afterglow greater than 0 parts per million for 0.5 seconds but not more than 80 parts per million for 0.5 seconds, and transmission of 10-70% with intrinsic emission wavelength equal to approximately 515 nm and layer thickness of 1.6 mm.

EFFECT: invention can be used in making X-ray detectors, computer tomography detectors and detectors for portable electronic signal conditioners.

10 cl, 1 ex