The Minister, by notice in the Gazette, may-
| b) | declare any substance containing uranium or thorium with concentration and mass limits higher than those specified in the notice, to be source material for the purposes of this Act; |
| c) | declare any of the following with concentration and mass levels higher than those specified in the notice, to be special nuclear material for the purposes of this Act, namely- |
| iii) | uranium enriched in its 235 or 233 isotope; |
| iv) | transuranium elements; or |
| v) | any composition of any of the materials referred to in subparagraphs (i), (ii), (iii) and (iv), or any composition of those materials and any other substance or substances; |
| e) | exempt any radioactive material from the provisions of this Act; |
| g) | determine the levels of specific activity and total activity of radioactive material below which the provisions of this Act do not apply. |