49 CFR 173.428
Empty Class 7 (radioactive) materials packaging.
A packaging which previously contained Class 7 (radioactive) materials and has been emptied of contents as far as practical, is excepted from the shipping paper, certification, and marking requirements of this subchapter, and from requirements of this chapter, provided that—
(a) The packaging meets the requirements of § 173.421(a) (2), (3), and (5) of this subpart;
(b) The packaging is in unimpaired condition and is securely closed so that there will be no leakage of Class 7 (radioactive) material under conditions normally incident to transportation;
(c) Internal contamination does not exceed 100 times the limits in § 173.443(a);
(d) Any labels previously applied in conformance with subpart E of part 172 of this subchapter are removed, obliterated, or covered and the “Empty” label prescribed in § 172.450 of this subchapter is affixed to the packaging; and
(e) The packaging is prepared for shipment as specified in § 173.422.
[Amdt. 173-244, 60 FR 50307, Sept. 28, 1995, as amended by Amdt. 173-244, 61 FR 20752, May 8, 1996; 64 FR 51919, Sept. 27, 1999]