D.C. Mun. Regs. tit. 22, r. 22-B6706
No licensee shall transport any radioactive material outside of the confines of the licensee's plant or other authorized location of use, or deliver any radioactive material to a carrier for transportation, unless the licensee complies with the requirements as specified in § 6706.2.
Each licensee shall transport materials with all requirements appropriate to the mode of transportation, relating to the packaging of the radioactive material and to the marking and labeling of the package and transporting vehicle, of the rules and regulations published by the U.S. Department of Transportation ( 46 C.F.R. § 148.04-1, 49 C.F.R. §§173 - 179, and 14 C.F.R. § 103) to the same extent as if the transportation were subject to the rules and regulations of that agency.
D.C. Mun. Regs. tit. 22, r. 22-B6706