GB790319A - Improvements in or relating to containers for radioactive materials - Google Patents

Abstract

790,319. Containers for radioactive materials. COLE, Ltd., E'. K., and DAVIS, R. G. April 3, 1956 [April 2, 1955], No. 9671/55. Class 98(1) A sealed container for radio-active material is of laminated construction, a plate A (Figs. 1 and 3), being formed as a shallow metal tray with a wide peripheral flange, wherein the material is placed, and which is covered by a second metal plate H of similar dimensions having an aperture I for a window of metallic foil J hermetically sealed to the plate on the side facing the tray A, the plates being secured closely together and hermetically sealed without obscuration of the window by sealing compound, and absorbing radiation from the material except in a direction through the window. A third plate C, having an aperture L corresponding to the window aperture may be placed between the tray A and plate H. The radioactive material may be sealed in a silver foil package B which is placed in the tray A and held in place by a wire ring D, e.g. of aluminium. Plate C is placed over the package B and screwed to tray A, after which plate H is screwed to tray A. Plate C is slightly smaller than plate H, so that a channel is formed between the edges of tray A and plate H and is filled with a sealing compound, which is also applied to the screws before insertion. Assembly must be carried out at least in part by remote-controlled means. A shield may be inserted in aperture L to shield the material until plate C has been screwed to the tray. A warning device is impressed on the underside of tray A. For storage or transit, the window is covered by a plate M held in place by straps N fastened to tray A by screws which do not pass completely through the tray and which therefore need not be treated with sealing compound.