Which item is categorized as LSA-3?

• A. Uranium and thorium ores and concentrates and other ores containing naturally occurring radionuclides that are intended to be processed for the use of these radionuclides
• B. Natural uranium, depleted uranium, natural thorium or their compounds or mixtures, providing they are unirradiated and in solid or liquid form
• C. Radioactive material that has an unlimited A2 value, other than fissile material not excepted under 10.3.7.2
• D. Other radioactive material in which the activity is distributed throughout and the estimated average specific activity does not exceed 30 times the values for activity concentration specified in 10.3.2

Answer: (C)

The key idea is how low specific activity (LSA) materials are classified for transport, with LSA-3 covering materials that have an unlimited A2 value, provided they are not fissile materials excluded under a specific regulation. This means the activity limit per radionuclide does not constrain the shipment, so such materials are placed in the LSA-3 category rather than being restricted by a finite A2 limit.

This item fits LSA-3 because it describes radioactive material with an unlimited A2 value, and it explicitly notes exceptions for fissile materials under a particular clause. The other descriptions refer to materials with finite or conditional activity limits or to specific natural materials that are typically covered under different categories, so they don’t match the defining feature of LSA-3.