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BS EN ISO 13164-4:2023

BS EN ISO 13164-4:2023

$142.49

Water quality. Radon-222 – Test method using two-phase liquid scintillation counting

Published By Publication Date Number of Pages
BSI 2023 26
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This document describes a test method for the determination of radon-222 (222Rn) activity concentration in non-saline waters by extraction and liquid scintillation counting. The 222Rn activity concentrations, which can be measured by this test method utilizing currently available instruments, are above 0,5 BqĀ·l?1 which is the typical detection limit for a 10 ml test sample and a measuring time of 1 h. It is the responsibility of the laboratory to ensure the validity of this test method for water samples of untested matrices. Annex A gives indication on the necessary counting conditions to meet the required detection limits for drinking water monitoring.

PDF Catalog

PDF Pages PDF Title
2 undefined
9 3.1 Terms and definitions
10 3.2 Symbols
11 5.1 General
5.2 Sampling with source preparation ā€œon siteā€
5.3 Sampling without ā€œon siteā€ source preparation
6.1 Reagents
12 6.2 Apparatus
7.1 Preparation of calibration sources
7.2 Optimization of counting conditions
13 7.3 Detection efficiency
7.4 Blank sample preparation and measurement
7.5 Sample preparation and measurement
14 8.1 General
8.2 Variables that could influence the measurement
8.3 Instrument verification
8.4 Contamination
15 8.5 Interference control
8.6 Method verification
8.7 Demonstration of analyst capability
9.1 General
9.2 Count rate
16 9.3 Calculation of activity concentration per unit of mass
9.4 Combined uncertainty
9.5 Decision threshold
17 9.6 Detection limit
9.7 Probabilistically symmetric coverage interval
9.7.1 Limits of the probabilistically symmetric coverage interval
18 9.7.2 The shortest coverage interval
9.8 Calculations using the activity concentration

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BS EN ISO 13164-4:2023
$142.49