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8. For the following parameters and radionuclides, the method of analysis used must, as a minimum be capable of measuring activity concentrations with a limit of detection specified below in Table E:
Parameters and radiouclides | Limit of detection(1) (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”, 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 ISO IEC Guide 98-3:2008 entitled “Guide to the expression of uncertainty in measurement”. | |
(3) The limit of detection for tritium and for radon is 10% of the corresponding parametric value of 100 Bg/l. | |
(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 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. | |
Tritium | 10 Bg/l(3) |
Radon | 10 Bg/l(3) |
gross alpha activity | 0.04 Bg/l(4) |
gross beta activity | 0.4 Bg/l(4) |
U-238 | 0.02 Bg/l |
U-234 | 0.02 Bg/l |
Ra-226 | 0.04 Bg/l |
Ra-228 | 0.02 Bg/l(5) |
Pb-210 | 0.02 Bg/l |
Po-210 | 0.01 Bg/l |
C-14 | 20 Bg/l |
Sr-90 | 0.4 Bg/l |
Pu-239/Pu-240 | 0.04 Bg/l |
Am-241 | 0.06 Bg/l |
Co-60 | 0.5 Bg/l |
Cs-134 | 0.5 Bg/l |
Cs-137 | 0.5 Bg/l |
I-131 | 0.5 Bg/l |
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