# The Radioactive Material (Road Transport) (Great Britain) Regulations 1996, Paragraph 9: Leaching and volumetric leakage assessment methods


For specimens which comprise or simulate indispersable solid material, a leaching assessment shall be performed as follows:
(a) The specimen shall be immersed for 7 days in water at ambient temperature. The volume of water to be used in the test shall be sufficient to ensure that at the end of the 7-day test period, the free volume of the unabsorbed and unreacted water remaining shall be at least 10% of the volume of the solid test sample itself. The water shall have an initial pH of 6–8 and a maximum conductivity of 1 mS/m at 20°C.
(b) The water with specimen shall then be heated to a temperature of (50±5)°C and maintained at this temperature for 4 hours.
(c) The activity of the water shall then be determined.
(d) The specimen shall then be stored for at least 7 days in still air of relative humidity not less than 90% at 30°C.
(e) The specimen shall then be immersed in water of the same specification as in (a) above and the water with the specimen heated to (50±5)°C and maintained at this temperature for 4 hours.
(f) The activity of the water shall then be determined.

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Source: https://www.legislation.gov.uk/uksi/1996/1350/schedule/15/part/II/paragraph/9 (the official version)
Page: https://openlegislation.uk/radioactive-material-road-transport-great-britain-regulations-1996/schedule-15/part-II/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.