| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: fluorescent ceramic material Gd2O2S:Pr with very short afterglow contains ëñ1 million parts by weight europium from Gd2O2S, and from ëÑ0.1 to ëñ100 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 1000-1400C and/or pressure of 100-300 MPa. The material is then annealed in air at temperature 700-1200C for 0.5-30 hours. Before annealing in air, the material can be annealed in a vacuum at temperature 1000-1400C 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 |
