Patent ID: 7354544

Claim:
A method for manufacturing a long-term storage container for storage of radioactive material to inhibit radioactive radiation therefrom, said container to have a bottom and upright wall extending therefrom, the top of said container configured to receive and be closable when a separate screw-on lid is fitted thereon, said container to have an integral inner container part of plastic material with a bottom and upright wall, an integral outer container part of plastic material with a bottom and upright wall, and radioactive radiation inhibiting material in an inter space between the walls and bottoms of said inner and outer container parts; the method comprising: a) integrally casting in a first mould from plastic material a first container part forming said integral inner container part; b) integrally casting in a second mould a moulded inter space container part of said radioactive radiation inhibiting material, said inter space container part having a bottom and a wall and forming a second container part; c) removing a first part of the first mould which formed a first side wall face and a first bottom face of the first container part; d) removing said inter space container part from the second mould; e) placing said inter space container in fitting engagement with said first wall face and said first bottom face of the first container part to form a first assembly of container parts, and with the first container part in engagement with a portion of a second part of the first mould; f) locating in a third mould the first assembly of container parts with said inter space container part in spaced relationship to a mould member of the third mould, so as to form a cavity between the member of the third mould and the inter space container part, the second part of the first mould having a portion inside the first container part to support it during moulding of the third container part, and a top of the second part of the first mould closing off an open end of said third mould member; g) through injection moulding of plastic material into said cavity integrally casting a third container part as said integral outer container part; and h) releasing a second assembly of container parts formed by the first, second and third container parts from the said third mould to provide said storage container.