25. The Table 4 referred to in Sections 2 and 3 of this Part—
| Substance or article | Maximum quantity of radionuclides for each substance or article | Maximum quantity of radionuclides: |
|---|---|---|
| (a) on any premises in items which satisfy the limit in column 2, or | ||
| (b) in mobile radioactive apparatus held by a person | ||
| A sealed source of a type not described in any other row of this Table | 4 x 106 Bq | 2 x 108 Bq |
| A Class A gaseous tritium light device | 2 x 1010 Bq | 5 x 1012 Bq |
| A Class B gaseous tritium light device | 1 x 1012 Bq | 3 x 1013 Bq |
| A Class C gaseous tritium light device | 1 x 1012 Bq | No limit |
| Any sealed source which is solely radioactive material or radioactive waste because it contains tritium | 2 x 1010 Bq | 5 x 1012 Bq |
| A tritium foil source | 2 x 1010 Bq | 5 x 1012 Bq |
| A smoke detector affixed to premises | 4 x 106 Bq | No limit |
| An electrodeposited source | 6 x 108 Bq Ni-63 or 2 x 108 Bq Fe-55 | 6 x 1011 Bq |
| A luminised article | 8 x 107 Bq Pm-147 or 4 x 109 Bq H-3 | 4 x 1010 Bq Pm-147 or 2 x 1011 Bq H-3 |
| A Ba-137m eluting source | 4 x 104 Bq Cs-137+ | 4 x 105 Bq Cs-137+ |
| A substance or article which is or contains magnesium alloy or thoriated tungsten in which the thorium concentration does not exceed 4% by mass | No limit | No limit |
| A uranium or thorium compound | Up to a total of 5kg of uranium and thorium | Up to a total of 5kg of uranium and thorium |
| A substance or article (other than a sealed source) which is intended for use for, used for, or arises from medical or veterinary diagnosis or treatment or clinical or veterinary trials | 1 x 109 Bq Tc-99m | 1 x 109 Bq Tc-99m |
| and | and | |
| in respect of the total for all other radionuclides— | 2 x 108 Bq of all other radionuclides, (no more than 1 x 108 Bq of which is contained in radioactive material) | |
| (i) 1 x 108 Bq if the substance or article is radioactive material, or | ||
| (ii) 2 x 108 Bq if the substance or article is radioactive waste |