49 CFR § 173.419 - Authorized packages - oxidizing Class 7 (radioactive) materials.
(a) An oxidizing Class 7 (radioactive) material, as referenced in the § 172.101 table of this subchapter, is authorized in quantities not exceeding an A2 per package, in a DOT Specification 7A package provided that -
(1) The contents are:
(i) Not fissile;
(ii) Packed in inside packagings of glass, metal or compatible plastic; and
(iii) Cushioned with a material that will not react with the contents; and
(2) The outside packaging is made of wood, metal, or plastic.
(c) For shipment by air, the maximum quantity in any package may not exceed 11.3 kg (25 pounds).