Amendment of the Radioactive Substances Act 1993S
2.—(1) In section 15(1) (further exemptions from sections 13 and 14) of the Radioactive Substances Act 1993 M1 after the words “clocks or watches” (where those words first appear) there shall be inserted the following:–
“(a)where the total quantity taken together of each of the radionuclides listed in column 1 of Table A below present in the clocks and watches on any premises does not exceed the amount set out in column 2–
TABLE A
| Radioactive material | Relevant value |
|---|---|
| Tritium | 109 becquerels |
| Promethium 147 | 107 becquerels |
| Radium 226 | 104 becquerels |
or
(b)where
(i)the total quantity of the radionuclides listed in column 2 of Table B below present in each such clock or watch of the type listed in column 1 of that table does not exceed the amount set out in column 3–
TABLE B
| Type of clock or watch | Radioactive material | Relevant value (becquerels) |
|---|---|---|
(i)Luminised time measurement instruments M2- (a)worn or carried on the person | Tritium Promethium 147 | 2.8 × 108 5.5 × 106 |
(b)not worn or carried on the person | Tritium Promethium 147 | 3.7 × 108 7.4 × 106 |
(ii)Special luminised time measurement instruments M3 | Tritium Promethium 147 | 9.3 × 108 1.9 × 107 |
(iii)Watches containing gaseous tritium light sources M4 | Tritium | 7.4 × 109 |
(iv)Radium luminised timepieces M5- (a)wristwatches | Radium 226 | 3.7 × 103 |
(b)alarm clocks | Radium 226 | 5.5 × 103 |
(c)special time measurement instruments | Radium 226 | 5.6 × 104 |
and
(ii)no more than five items falling within Table B which constitute radioactive waste are present on any premises”.
Marginal Citations
M2ISO 3157: 1991(E), “Radioluminescence for time measurement instruments – Specifications”.
M3ISO 3157: 1991(E), “Radioluminescence for time measurement instruments – Specifications”.
M4NEA, “Radiation Protection Standards for Gaseous Tritium Light Devices” (1973).
M5IAEA, “Radiation Protection Standards for Radioluminous Timepieces” (1967).