(1) Material designated in national law or by a regulatory body as being subject to regulatory control because of its radioactivity. Radioactive material should be used in the singular unless reference is explicitly being made to various materials. Some States use the term radioactive substance for this regulatory purpose. However, the term radioactive substance is also sometimes used to indicate that the scientific use of radioactive (See: Radioactive (1)) is intended, rather than the regulatory meaning of radioactive (See: Radioactive (2)) suggested by the term radioactive material. It is therefore essential that any such distinctions in meaning are clarified. In regulatory terminology in some States, radioactive material ceases to be radioactive material when it becomes radioactive waste; the term radioactive substance is used to cover both, i.e. radioactive substance includes radioactive material and radioactive waste. (2) Any material containing radionuclides where both the activity concentration and the total activity in the consignment exceed the values specified in paras 401-406 [of the Transport Regulations]. This usage is specific to the Transport Regulations, and should otherwise be avoided