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Regulation 3(1)
For the purpose of regulation 3(1), the specified mass of a fissile material shall be—
(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; |
(d)uranium enriched in U 235 to more than 5% – | 250 grams. |
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