Nuclear energy - Nuclear fuel cycle technology - Waste - Determination of iodine 129 activity in liquid or solid waste

Introduction 5

1 Domaine d'application 5

2 Références normatives 5

3 Termes et définitions 6

4 Principe de la méthode 7

5 Appareillage 7

5.1 Séparation chimique 7

5.2 Équipement de spectrométrie X ou gamma 7

5.3 Conteneur pour la mesure 8

6 Réactifs et consommables 8

7 Mode opératoire 9

7.1 Traitement préalable de l'échantillon 9

7.1.1 Ajustage de la teneur en iode total 9

7.1.2 Mise en solution de l'échantillon solide 9

7.1.3 Ajustage des paramètres physico-chimiques pour la séparation 9

7.2 Séparation par extraction liquide-liquide 10

7.3 Mesure de l'iode 10

7.3.1 Mesure de l'iode 129 10

7.3.2 Efficacité de comptage en fonction de l'énergie 11

7.4 Détermination du rendement de séparation 11

7.4.1 Cas de l'iode 131 11

7.4.2 Cas de l'iode naturel 12

7.5 Calcul de l'activité volumique 12

7.6 Incertitude-type 13

7.7 Seuil de décision 14

7.8 Limite de détection 14

8 Détermination de l'activité massique de l'échantillon 14

9 Interférences 14

10 Rapport d'analyse 15

Bibliographie 16

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