# The Radioactive Material (Road Transport) (Great Britain) Regulations 1996, Paragraph 5: Percussion test:


The specimen shall be placed on a sheet of lead which is supported by a smooth solid surface and struck by the flat face of a steel billet so as to produce an impact equivalent to that resulting from a free drop of 1.4 kg through 1 metre. The flat face of the billet shall be 25 mm in diameter with the edges rounded off to a radius of (3.0±0.3)mm. The lead, of hardness number 3.5 to 4.5 on the Vickers scale and not more than 25 mm thick, shall cover an area greater than that covered by the specimen. A fresh surface of lead shall be used for each impact. The billet shall strike the specimen so as to cause maximum damage.

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Source: https://www.legislation.gov.uk/uksi/1996/1350/schedule/15/part/II/paragraph/5 (the official version)
Page: https://openlegislation.uk/radioactive-material-road-transport-great-britain-regulations-1996/schedule-15/part-II/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.