Undersökning av vattens fysikaliska egenskaper

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: CEN
Svarsdatum: den 25 aug 2019
Se merSe mindre
 

This part of ISO 13164 gives general guidelines for sampling, packaging, and transporting of all kinds of

water samples, for the measurement of the activity concentration of radon-222.

The test methods fall into two categories:

a) direct measurement of the water sample without any transfer of phase (see ISO 13164-2);

b) indirect measurement involving the transfer of the radon-222 from the aqueous phase to another

phase (see ISO 13164-3).

The test methods can be applied either in the laboratory or on site.

The laboratory is responsible for ensuring the suitability of the test method for the water samples tested.

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: CEN
Svarsdatum: den 25 aug 2019
Se merSe mindre
 

This part of ISO 13164 specifies a test method for the determination of radon-222 activity concentration

in a sample of water following the measurement of its short-lived decay products by direct gammaspectrometry

of the water sample (see Annex A).

The radon-222 activity concentrations, which can be measured by this test method utilizing currently

available gamma-ray instruments, range from a few becquerels per litre to several hundred thousand

becquerels per litre for a 1 l test sample.

This test method can be used successfully with drinking water samples. The laboratory is responsible

for ensuring the validity of this test method for water samples of untested matrices.

Annex B gives indication on the necessary counting conditions to meet the required sensitivity for

drinking water monitoring.

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: CEN
Svarsdatum: den 25 aug 2019
Se merSe mindre
 

This part of ISO 13164 specifies a test method for the determination of radon-222 activity concentration

in a sample of water following its transfer from the aqueous phase to the air phase by degassing and its

detection. It gives recommendations for rapid measurements performed within less than 1 h.

The radon-222 activity concentrations, which can be measured by this test method utilizing currently

available instruments, range from 0,1 Bq l−1 to several hundred thousand becquerels per litre for a

100 ml test sample.

This test method is used successfully with drinking water samples. The laboratory is responsible for

ensuring the validity of this test method for water samples of untested matrices.

This test method can be applied on field sites or in the laboratory.

Annexes A and B give indications on the necessary counting conditions to meet the required sensitivity

for drinking water monitoring.

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: CEN
Svarsdatum: den 25 aug 2019
Se merSe mindre
 

This part of ISO 13164 describes a test method for the determination of radon-222 (222Rn) activity

concentration in non-saline waters by extraction and liquid scintillation counting.

The radon-222 activity concentrations, which can be measured by this test method utilizing currently

available instruments, are at least above 0,5 Bq l−1 for a 10 ml test sample and a measuring time of 1 h.

This test method can be used successfully with drinking water samples and 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.

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: CEN
Svarsdatum: den 25 aug 2019
Se merSe mindre
 

This part of ISO 13165 specifies the determination of radium-226 (226Ra) activity concentration in nonsaline

water samples by extraction of its daughter radon-222 (222Rn) and its measurement using liquid

scintillation counting.

Radium-226 activity concentrations which can be measured by this test method utilizing currently

available liquid scintillation counters goes down to 50 mBq l−1. This method is not applicable to the

measurement of other radium isotopes.

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: CEN
Svarsdatum: den 25 aug 2019
Se merSe mindre
 

This part of ISO 13165 specifies the determination of radium-226 (226Ra) activity concentration in all

types of water by emanometry.

The method specified is suitable for the determination of the soluble, suspended, and total 226Ra activity

concentration in all types of water with soluble 226Ra activity concentrations greater than 0,02 Bq l−1.

In water containing high activity concentrations of 228Th, interference from 220Rn decay products can

lead to overestimation of measured levels (see Figure A.2).

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: CEN
Svarsdatum: den 25 aug 2019
Se merSe mindre
 

This part of ISO 13165 specifies the determination of radium-226 (226Ra) activity concentration in all types of water by coprecipitation followed by gamma-spectrometry (see ISO 18589‑3).

The method described is suitable for determination of soluble 226Ra activity concentrations greater than 0,02 Bq l−1 using a sample volume of 1 l to 100 l of any water type.

For water samples smaller than a volume of 1 l, direct gamma-spectrometry can be performed following ISO 10703 with a higher detection limit.

NOTE This test method also allows other isotopes of radium, 223Ra, 224Ra, and 228Ra, to be determined.

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: CEN
Svarsdatum: den 20 sep 2019
Se merSe mindre
 

This document provides guidelines to enable testing laboratory using rapid test methods on all types of water samples that may be contaminated following a nuclear or radiological emergency situation:

— taking into account the specific context for the tests to be performed, e.g. an unknown and potentially unusual high level of contamination;

— using or adjusting, when possible, radioactivity test method implemented during routine situation to obtain a result rapidly or applying specific rapid test methods previously validated by the laboratory, e.g. for 89Sr determination;

— preparing the test laboratory to measure a large number of potentially contaminated samples.

The aim of this document is to ensure decision makers have reliable results needed to take actions on time and minimize the dose to the public.

Measurements are performed in order to minimize the risk for the public in checking the water quality of water supplies. For emergency situations, test results are compared to operational intervention levels.

Note Operational intervention levels (OILs) are derived from IAEA Safety Standards[13] or national authorities[5].

A key can be to use the usual and routine methods in a faster manner. The goal of these rapid measurements is often to check an unusual radioactivity level in the test sample, to identify the radionuclides and their activity concentration levels and to establish compliance of the sampled water with intervention levels[21]. It should be noted that in such circumstances validation parameters are not always valid (impossible use of standard measuring geometries for gamma spectrometry…) and thus uncertainties associated with the test results may increase.

The first steps of the analytical approach is usually based on gross alpha and gross beta test methods considered as screening methods (adaptation of ISO 10704 and ISO 11704) and gamma spectrometry (adaptation of ISO 20042, ISO 10703 and ISO 19581). Then, when necessary[3], test method standards for specific radionuclides are adapted and applied (for example, 90Sr measurement following ISO 13160) as proposed in Annex A.

This document refers to a set of already published ISO standards. When appropriate, this document also refers to national standards or other publically available documents.

Screening techniques that can be carried out directly in the field are not part of this document.