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BS EN ISO 13160:2021

BS EN ISO 13160:2021

$198.66

Water quality. Strontium 90 and strontium 89. Test methods using liquid scintillation counting or proportional counting

Published By Publication Date Number of Pages
BSI 2021 52
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This document specifies conditions for the determination of 90Sr and 89Sr activity concentration in samples of environmental water using liquid scintillation counting (LSC) or proportional counting (PC).

The method is applicable to test samples of drinking water, rainwater, surface and ground water, marine water, as well as cooling water, industrial water, domestic, and industrial wastewater after proper sampling and handling, and test sample preparation. Filtration of the test sample and a chemical separation are required to separate and purify strontium from a test portion of the sample.

The detection limit depends on the sample volume, the instrument used, the sample count time, the background count rate, the detection efficiency and the chemical yield. The method described in this document, using currently available LSC counters, has a detection limit of approximately 10 mBq l?1 and 2 mBq l?1 for 89Sr and 90Sr, respectively, which is lower than the WHO criteria for safe consumption of drinking water (100 BqĀ·l?1 for 89Sr and 10 BqĀ·l?1 for 90Sr)[ 3 ]. These values can be achieved with a counting time of 1 000 min for a sample volume of 2 l.

The methods described in this document are applicable in the event of an emergency situation. When fallout occurs following a nuclear accident, the contribution of 89Sr to the total amount of radioactive strontium is not negligible. This document provides test methods to determine the activity concentration of 90Sr in presence of 89Sr.

The analysis of 90Sr and 89Sr adsorbed to suspended matter is not covered by this method.

It is the userā€™s responsibility to ensure the validity of this test method selected for the water samples tested.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
7 Foreword
8 Introduction
11 1 Scope
2 Normative references
12 3 Terms and definitions
4 Principle
4.1 General
13 4.2 Chemical separation
4.3 Detection
5 Chemical reagents and equipment
14 6 Procedure
6.1 Test sample preparation
6.2 Chemical separation
6.2.1 General
15 6.2.2 Precipitation techniques
16 6.2.3 Liquidā€“liquid extraction technique
6.2.4 Chromatographic technique
6.3 Preparation of the source for test
6.3.1 Source preparation for liquid scintillation counter
6.3.2 Source preparation for proportional counter
17 6.4 Measurement
6.4.1 General
6.4.2 Liquid scintillation counter
6.4.3 Proportional counter
18 6.4.4 Efficiency calculation
6.4.5 Determination of the chemical yield
19 7 Expression of results
7.1 Determination of 90Sr in equilibrium with 90Y
7.1.1 Calculation of the activity concentration
7.1.2 Standard uncertainty
20 7.1.3 Decision threshold
7.1.4 Detection limit
7.2 Determination of 90Sr from separated 90Y
7.2.1 Calculation of the activity concentration
21 7.2.2 Standard uncertainty
22 7.2.3 Decision threshold
7.2.4 Detection limit
7.3 Determination of 90Sr and 89Sr utilizing 90Sr/90Y equilibrium
7.3.1 Calculation of the activity concentration
23 7.3.2 Standard uncertainty
24 7.3.3 Decision threshold
7.3.4 Detection limit
25 8 Limits of the coverage intervals
8.1 Limits of the of the probabilistically symmetric coverage interval
8.2 Limits of the shortest coverage interval
9 Quality control
10 Test report
27 Annex A (informative) Determination of 89Sr and 90Sr by precipitation and proportional counting
31 Annex B (informative) Determination of 89Sr and 90Sr by precipitation and liquid scintillation counting
35 Annex C (informative) Determination of 90Sr from its decay progeny 90Y at equilibrium by organic extraction and liquid scintillation counting
38 Annex D (informative) Determination of 90Sr after ionic exchange separation by proportional counting
41 Annex E (informative) Determination of 90Sr after separation on a crown ether specific resin and liquid scintillation counting
43 Annex F (informative) Determination of 90Sr from its decay progeny 90Y at equilibrium by organic extraction and proportional counting
47 Annex G (informative) Correction factor for 90Sr purity using proportional counting
50 Bibliography

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BS EN ISO 13160:2021
$198.66