NF ISO 11665-7
Measurement of radioactivity in the environment - Air : radon-222 - Part 7 : accumulation method for estimating surface exhalation rate
ISO 11665-7:2012 gives guidelines for estimating the radon-222 surface exhalation rate over a short period (a few hours), at a given place, at the interface of the medium (soil, rock, laid building material, walls, etc.) and the atmosphere. This estimation is based on measuring the radon activity concentration emanating from the surface under investigation and accumulated in a container of a known volume for a known duration. This method is estimative only, as it is difficult to quantify the influence of many parameters in environmental conditions. ISO 11665-7:2012 is particularly applicable, however, in case of an investigation, a search for sources or a comparative study of exhalation rates at the same site. ISO 11665-7:2012 does not cover calibration conditions for the rate estimation devices.
ISO 11665-7:2012 gives guidelines for estimating the radon-222 surface exhalation rate over a short period (a few hours), at a given place, at the interface of the medium (soil, rock, laid building material, walls, etc.) and the atmosphere. This estimation is based on measuring the radon activity concentration emanating from the surface under investigation and accumulated in a container of a known volume for a known duration.
This method is estimative only, as it is difficult to quantify the influence of many parameters in environmental conditions. ISO 11665-7:2012 is particularly applicable, however, in case of an investigation, a search for sources or a comparative study of exhalation rates at the same site. ISO 11665-7:2012 does not cover calibration conditions for the rate estimation devices.
Le présent document donne des recommandations pour estimer le flux surfacique d'exhalation du radon 222, en un point donné et à un instant donné, aux interfaces avec l'atmosphère, à partir de la mesure de l'activité volumique du radon 222 à l'intérieur d'un conteneur d'accumulation. Il décrit le mode de prélèvement et les conditions d'utilisation. Il doit être utilisé conjointement avec les normes NF M 60-763, NF M 60-767 et NF M 60-769.
<p>ISO 11665-7:2012 gives guidelines for estimating the radon-222 surface exhalation rate over a short period (a few hours), at a given place, at the interface of the medium (soil, rock, laid building material, walls, etc.) and the atmosphere. This estimation is based on measuring the radon activity concentration emanating from the surface under investigation and accumulated in a container of a known volume for a known duration.</p> <p>This method is estimative only, as it is difficult to quantify the influence of many parameters in environmental conditions. ISO 11665-7:2012 is particularly applicable, however, in case of an investigation, a search for sources or a comparative study of exhalation rates at the same site. ISO 11665-7:2012 does not cover calibration conditions for the rate estimation devices.</p>
- Avant-proposiv
- Introductionv
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1 Domaine d'application1
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2 Références normatives1
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3 Termes, définitions et symboles1
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3.1 Termes et définitions1
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3.2 Symboles2
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4 Principe de la méthode de mesure pour l'estimation du flux surfacique d'exhalation3
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5 Équipement4
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6 Accumulation du radon dans un conteneur5
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6.1 Caractéristiques de l'accumulation5
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6.2 Durée d'accumulation5
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7 Prélèvement5
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7.1 Objectif du prélèvement5
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7.2 Caractéristiques du prélèvement6
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7.3 Durée du prélèvement6
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7.4 Volume d'air prélevé6
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8 Méthode de détection6
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9 Mesurage6
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9.1 Mode opératoire6
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9.2 Grandeurs d'influence7
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10 Expression des résultats8
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10.1 Flux surfacique d'exhalation du radon8
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10.2 Incertitude type8
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10.3 Seuil de décision et limite de détection8
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10.4 Limites de l'intervalle de confiance8
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11 Rapport d'essai8
- Annexe A (informative) Exemple de Fiche des résultats de prélèvement10
- Annexe B (informative) Estimation d'un flux surfacique d'exhalation du radon en utilisant une méthode de mesure en continu12
- Annexe C (informative) Estimation d'un flux surfacique d'exhalation du radon en utilisant une méthode de mesure ponctuelle18
- Bibliographie23
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