49 CFR 172 Special Provision 139 (Numeric Codes)

These provisions are multi-modal and apply to bulk and non-bulk packagings.

Code	139
Description	Use of the “special arrangement” proper shipping names for international shipments must be made under an IAEA Certificate of Competent Authority issued by the Associate Administrator in accordance with the requirements in §173.471, §173.472, or §173.473 of this subchapter. Use of these proper shipping names for domestic shipments may be made only under a DOT special permit, as defined in, and in accordance with the requirements of subpart B of part 107 of this subchapter.
HazMat with this Code	UN 3331 - Radioactive material, transported under special arrangement, fissile UN 2919 - Radioactive material, transported under special arrangement, non fissile or fissile excepted