# The Radioactive Material (Road Transport) (Great Britain) Regulations 1996, Paragraph 3


The outer surface of any uranium or thorium in the structure of the package shall be covered with an inactive sheath made of metal or some other substantial material.

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Source: https://www.legislation.gov.uk/uksi/1996/1350/schedule/5/paragraph/3 (the official version)
Page: https://openlegislation.uk/radioactive-material-road-transport-great-britain-regulations-1996/schedule-5/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.