# The Radioactive Material (Road Transport) (Great Britain) Regulations 1996, Paragraph 4


An A value for a mixture of radionuclides whose identities and respective activities are known may be determined as follows:
(a) for special form radioactive material:
A1for mixture=1∑if(i)A1(i)
(b) for other forms of radioactive material:
A2for mixture=1∑if(i)A2(i) where
f(i) is the fraction of activity of nuclide in the mixture and A1(i) and A2(i) are the respective A1 and A2 values for nuclide i.

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Source: https://www.legislation.gov.uk/uksi/1996/1350/schedule/1/paragraph/4 (the official version)
Page: https://openlegislation.uk/radioactive-material-road-transport-great-britain-regulations-1996/schedule-1/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.