Schedule 19 Determination of categories
Packages and overpacks shall be assigned to either category I-WHITE, II-YELLOW or III-YELLOW in accordance with the conditions specified in Tables IX and X of Schedule 36, as applicable, and with the following requirements:
For a package, both the Transport Index (TI) and the surface radiation level conditions shall be taken into account in determining which is the appropriate category. Where the Transport Index (TI) satisfies the condition for one category but the surface radiation level satisfies the condition for a different category, the package shall be assigned to the higher category of the two. For this purpose, category I-WHITE shall be regarded as the lowest category.
The Transport Index (TI) shall be determined following the procedures specified in Schedule 17, and subject to the limitation of paragraph 14 of Schedule 2.
If the Transport Index (TI) is greater than 10, the package or overpack shall be transported under exclusive use.
If the surface radiation level is greater than 2 mSv/h, the package or overpack shall be transported under exclusive use and in accordance with the conditions prescribed in paragraph (a) of Schedule 32.
A package transported under special arrangement shall be assigned to category III-YELLOW.
An overpack which contains packages transported under special arrangement shall be assigned to category III-YELLOW.