23. An excepted package shall not contain an activity greater than:
(a) The limits specified in columns (B) and (C) of the Eighth Schedule for each individual item and each package respectively where the radioactive material or nuclear material is enclosed in or is included as a component part of an instrument or other manufactured article; or
(b) The limits specified in column (D) of the Eighth Schedule where the radioactive material or nuclear material is not enclosed in or is not included as a component of an instrument or other manufactured article.
24. An excepted package that contain any quantity of such article manufactured of unirradiated natural uranium, unirradiated depleted uranium or unirradiated natural thorium may be transported provided that the outer surface of the uranium or thorium is enclosed in an inactive sheath made of metal or some other substantial material.