Minnesota Mining and Manufacturing Company

Montedison S.p.a.

Sergio Pizzini

Romano Morlotti

Laura Oggioni

Alessandro Parisi

Luigi Pelosini

An X-ray intensifying screen comprises a support and a layer containing a direct emission phosphor formed without a binder. The preferred direct emission phosphor is a rare earth silicate phosphor. Said X-ray intensifying screen is useful in the methods for recording and reproducing high energy radiation images. A process for the preparation of the binderless phosphor layer by reactive spray pyrolysis is also disclosed.

X-ray intensifying screens and method of manufacturing the same

A process is disclosed for purifying silicon wherein silicon in the molten state is reacted with barium carbonate and/or oxide and/or hydroxide and then, after cooling and crushing, leached with one or more dilute inorganic acids. Preferably an oxidizing gas such as oxygen or water vapor is blown into the molten mass during the reaction, which is conducted at a temperature in the range of from 1550.degree. to 2000.degree. C. The inorganic acid may be for example hydrochloric acid, hydrofluoric acid, nitric acid, sulphuric acid, or mixtures thereof.

Growing community of inventors

Sesto Calende, Italy

Sergio Pizzini