US lawFederal (United States)RegulationsTitle 10 CFR — EnergyChapter I — NUCLEAR REGULATORY COMMISSIONPart 71 — PACKAGING AND TRANSPORTATION OF RADIOACTIVE MATERIALSubpart E — Package Approval Standards71.6310 C.F.R. § 71.63Special requirement for plutonium shipments.Last amended: 2017Year: 2026Length: 30 wordsOfficial source Cite as 10 C.F.R. § 71.63 (2026)Shipments containing plutonium must be made with the contents in solid form, if the contents contain greater than 0.74 TBq (20 Ci) of plutonium. [69 FR 3795, Jan. 26, 2004]Previous10 C.F.R. § 71.59Next10 C.F.R. § 71.64