Scintillation crystals having reduced afterglow and methods...

C - Chemistry – Metallurgy – 30 – B

Patent

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C30B 15/04 (2006.01) C30B 15/00 (2006.01) G01T 1/202 (2006.01)

Patent

CA 2198064

Methods of making a scintillation crystal having reduced afterglow include preparing a crystal melt according to the Czochralsky technique and doping the melt with an element or a compound which reduces afterglow without significantly reducing the luminescence light output of the crystal grown in the melt. Experiments have shown that doping the melt with any one of calcium, cobalt, germanium, niobium, sodium, and chromium significantly reduces afterglow without unduly reducing the luminescence light output of the crystal. The presently preferred dopant is cobalt, which is added to the melt in concentrations of approximately 10ppm to 50ppm. Crystals made according to the method of the invention exhibit significantly less afterglow than crystals made from the same raw materials without doping. By choice of the proper concentration of dopant, the light output of the crystal during luminescence is not adversely affected.

éthodes de fabrication d'un cristal de détecteur de scintillation présentant une postluminescence réduite comprenant la préparation d'un bain de cristallisation selon la technique de Czochralsky et le dopage du produit en fusion par un élément ou un composé qui réduit la postluminescence sans réduire substantiellement la luminescence produite par le cristal que l'on a fait croître dans le bain de cristallisation. Des expériences ont montré que le dopage du bain de fusion avec un des éléments suivants, calcium, cobalt, germanium, niobium, sodium et chrome, réduisait substantiellement la postluminescence sans réduire indûment la luminescence produite par le cristal. Le dopant actuellement préféré est le cobalt, qui est ajouté au bain de fusion à des concentrations d'approximativement 10 ppm à 50 ppm. Les cristaux fabriqués selon la méthode divulguée dans l'invention présentent substantiellement moins de postluminescence que les cristaux fabriqués avec les mêmes matières premières sans dopage. En choisissant la bonne concentration de dopant, la lumière produite par le cristal au cours de la luminescence n'est pas touchée de manière défavorable.

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