SCHEDULE 23Radioactive substances activities
PART 2Interpretation
Radionuclides not of natural terrestrial or cosmic origin
6.
A substance or article which contains one or more radionuclides that are not of natural terrestrial or cosmic origin is radioactive material or radioactive waste where—
(a)
the substance or article is a solid or a relevant liquid and it has a concentration of radioactivity which exceeds the value specified in column 2 of Table 2, or
(b)
the substance is any other liquid or a gas.