49 CFR §173.419

1. (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. (1)The contents are:
      1. (i)Not fissile;
      2. (ii)Packed in inside packagings of glass, metal or compatible plastic; and
      3. (iii)Cushioned with a material that will not react with the contents; and
   2. (2)The outside packaging is made of wood, metal, or plastic.
2. (b)The package must be capable of meeting the applicable test requirements of § 173.465 without leakage of contents.
3. (c)For shipment by air, the maximum quantity in any package may not exceed 11.3 kg (25 pounds).