- Y Diweddaraf sydd Ar Gael (Diwygiedig)
- Gwreiddiol (a wnaed Fel)
Dyma’r fersiwn wreiddiol (fel y’i gwnaed yn wreiddiol).
Regulation 25(1)(b)
1. The district council must ensure that each sample is analysed for indicative dose in accordance with Annex III to Directive 2013/51 and this Part.
2. For each parameter and radionuclide specified in the first column of Table 1 in Part 2, the derived concentration and dose coefficient for calculating the indicative dose is specified in the second column of that table.
3. For each parameter specified in the first column of Table 2 in Part 2, the method of analysis must be one that is capable of detecting the parameter at the limit of detection specified in the second column of that table.
4. If the following formula is satisfied, the indicative dose is considered to be less than the parametric value of 0.1 mSv and no further investigation is required—
where
Ci(obs) = observed concentration radionuclide i
Ci(der) = derived concentration of radionuclide i
n = number of radionuclides detected
Origin | Nuclide | Derived concentration |
---|---|---|
(1) This table allows only for the radiological properties of uranium, not for its chemical toxicity. | ||
Natural | U-238(1) | 3.0 Bq/l |
U-234(1) | 2.8 Bq/l | |
Ra-226 | 0.5 Bq/l | |
Ra-228 | 0.2 Bq/l | |
Pb-210 | 0.2 Bq/l | |
Po-210 | 0.1 Bq/l | |
Artificial | C-14 | 240 Bq/l |
Sr-90 | 4.9 Bq/l | |
Pu-239/Pu-240 | 0.6 Bq/l | |
Am-241 | 0.7 Bq/l | |
Co-60 | 40 Bq/l | |
Cs-134 | 7.2 Bq/l | |
Cs-137 | 11 Bq/l | |
I-131 | 6.2 Bq/l |
Parameters and radionuclides | Limit of detection(1) (2) | |
---|---|---|
(1) The limit of detection is calculated according to the ISO standard 11929: Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionising radiation – Fundamentals and application, with probabilities of errors of 1st and 2nd kind of 0.05 each. | ||
(2) Measurement uncertainties are calculated and reported as complete standard uncertainties, or as expanded standard uncertainties with an expansion factor of 1.96, according to the ISO Guide for the Expression of Uncertainty in Measurement. | ||
(3) The limit of detection for tritium and for radon is 10% of its parametric value of 100 Bq/l. | ||
(4) The limit of detection for gross alpha activity and gross beta activities are 40% of the screening values of 0.1 and 1.0 Bq/l respectively. | ||
(5) This limit of detection applies only to initial screening for indicative dose for a new water source. If initial checking indicates that it is not plausible that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0.08 Bq/l for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required. | ||
Tritium | 10 Bq/l (3) | |
Radon | 10 Bq/l (3) | |
gross alpha activity gross beta activity | 0.04 Bq/l (4) 0.4 Bq/l (4) | |
U-238 | 0.02 Bq/l | |
U-234 | 0.02 Bq/l | |
Ra-226 | 0.04 Bq/l | |
Ra-228 | 0.02 Bq/l (5) | |
Pb-210 | 0.02 Bq/l | |
Po-210 | 0.01 Bq/l | |
C-14 | 20 Bq/l | |
Sr-90 | 0.4 Bq/l | |
Pu-239/Pu-240 | 0.04 Bq/l | |
Am-241 | 0.06 Bq/l | |
Co-60 | 0.5 Bq/l | |
Cs-134 | 0.5 Bq/l | |
Cs-137 | 0.5 Bq/l | |
I-131 | 0.5 Bq/l |
Y Diweddaraf sydd Ar Gael (diwygiedig):Y fersiwn ddiweddaraf sydd ar gael o’r ddeddfwriaeth yn cynnwys newidiadau a wnaed gan ddeddfwriaeth ddilynol ac wedi eu gweithredu gan ein tîm golygyddol. Gellir gweld y newidiadau nad ydym wedi eu gweithredu i’r testun eto yn yr ardal ‘Newidiadau i Ddeddfwriaeth’.
Gwreiddiol (Fel y’i Deddfwyd neu y’i Gwnaed): Mae'r wreiddiol fersiwn y ddeddfwriaeth fel ag yr oedd pan gafodd ei deddfu neu eu gwneud. Ni wnaed unrhyw newidiadau i’r testun.
Explanatory Memorandum sets out a brief statement of the purpose of a Statutory Rule and provides information about its policy objective and policy implications. They aim to make the Statutory Rule accessible to readers who are not legally qualified and accompany any Northern Ireland Statutory Rule or Draft Northern Ireland Statutory Rule laid before the UK Parliament during the suspension of the Northern Ireland Assembly.
Gallwch wneud defnydd o ddogfennau atodol hanfodol a gwybodaeth ar gyfer yr eitem ddeddfwriaeth o’r tab hwn. Yn ddibynnol ar yr eitem ddeddfwriaeth sydd i’w gweld, gallai hyn gynnwys:
Defnyddiwch y ddewislen hon i agor dogfennau hanfodol sy’n cyd-fynd â’r ddeddfwriaeth a gwybodaeth am yr eitem hon o ddeddfwriaeth. Gan ddibynnu ar yr eitem o ddeddfwriaeth sy’n cael ei gweld gall hyn gynnwys:
liciwch ‘Gweld Mwy’ neu ddewis ‘Rhagor o Adnoddau’ am wybodaeth ychwanegol gan gynnwys