# The Radiation (Emergency Preparedness and Public Information) Regulations 2019, Paragraph

Extent: E+W+S

For the purpose of regulation 3(1), the specified mass of a fissile material set out below is—
(a) plutonium as Pu-239 or Pu-241 or as a mixture of plutonium isotopes containing Pu-239 or Pu-241 – 150 grams;
(b) uranium as U-233 – 150 grams;
(c) uranium enriched in U-235 to more than 1% but not more than 5% - 500 grams; and
(d) uranium enriched in U-235 to more than 5% - 250 grams.

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Source: https://www.legislation.gov.uk/uksi/2019/703/schedule/2/paragraph/wrapper2n1 (the official version)
Page: https://openlegislation.uk/radiation-emergency-preparedness-and-public-information-regulations-2019/schedule-2/paragraph-wrapper2n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.