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 and marking (except for the UN identification number marking requirement described in § 173.422(a)) requirements of this subchapter, provided that -
(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) The outer surface of any uranium or thorium in its structure is covered with an inactive sheath made of metal or some other substantial material;
(d) Internal contamination does not exceed 100 times the limits in § 173.443(a);
(e) 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
(f) The packaging is prepared for shipment as specified in § 173.422.