METHOD OF PRODUCING X-RAY PHOSPHOR GDOS:TB Russian patent published in 2020 - IPC C09K11/84 

FIELD: medicine.

SUBSTANCE: invention refers to medicine and industrial flaw detection and can be used in making reinforcing X-ray luminescent screens. First, terbium is uniformly deposited on the surface of gadolinium oxide particles by iodine transport by heat treatment of a mixture of gadolinium oxide and terbium iodide in an inert gas atmosphere for 0.1–6 hours at temperature of 500–1200 °C and pressure of 1–3 atm. Uniform film of partially oxidised terbium is obtained on the surface of each gadolinium oxide particle. For additional oxidation of the terbium layer thermal treatment is carried out in air at temperature 800–1000 °C for 1–2 hours. Obtained gadolinium oxide coated with a terbium layer is used in the preparation of a mixture which also contains lithium sulphur and fluoride as a melting pot, into which there is additionally added another plume - sodium pyrophosphate. Prepared mixture is calcined. Obtained X-ray phosphor Gd₂O₂S:Tb is washed from polysulphides.

EFFECT: invention increases intensity of X-ray luminescence due to increased uniformity of distribution of activator in the charge and reduces the number of non-luminescent particles which are defects.

1 cl, 1 tbl, 1 dwg, 2 ex