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5. For each parameter or radionuclide listed in column 1 of the table below, the method of analysis used must be capable of measuring activity concentrations with at least the limit of detection specified for that parameter or radionuclide in column 2.
1 The limit of detection must be calculated according to the ISO standard 11929:2010 entitled “Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionising radiation - Fundamentals and application” (as it was first published), with probabilities of errors of 1st and 2nd kind of 0.05 each. | |
2 Measurement uncertainties must be calculated and reported as complete standard uncertainties, or as expanded standard uncertainties with an expansion factor of 1.96, according to the ISOIEC Guide 98-3:2008 entitled “Guide to the expression of uncertainty inmeasurement” (as it was first published). | |
3 The limit of detection for tritium and for radon is 10% of the corresponding prescribed concentration or value for the parameter. | |
4 The limit of detection for gross alpha activity and gross beta activities is 40% of the screening values of 0.1 Bq/l and 1.0 Bq/l respectively. | |
5 This limit of detection applies only to initial screening for total indicative dose for a new water source. If initial checking indicates that it is unlikely 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.] | |
Parameter / radionuclide | Limit of detection (in Bq/l12 |
---|---|
Tritium | 103 |
Radon | 103 |
gross alpha activity | 0.044 |
gross beta activity | 0.44 |
U-238 | 0.02 |
U-234 | 0.02 |
Ra-226 | 0.04 |
Ra-228 | 0.025 |
Pb-210 | 0.02 |
Po-210 | 0.01 |
C-14 | 20 |
Sr-90 | 0.4 |
Pu-239 / Pu-240 | 0.04 |
Am-241 | 0.06 |
Co-60 | 0.5 |
Cs-134 | 0.5 |
Cs-137 | 0.5 |
I-131 | 0.5 |
Notes— |
Textual Amendments
F1Sch. 5A inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 12
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