254 Les effets biologiques et sanitaires du tritium : questions d’actualité et que l’effet d’une exposition chronique à du tritium organiquement lié serait supérieur d’un facteur 4 à 6 à celui d’une exposition aiguë à de l’eau tritiée. Néanmoins, les données disponibles sont très insuffisantes, et l’évaluation des incertitudes quant à l’estimation des DPUI controversée (CERRIE, 2004). Des organismes tels que le CERI (2003), le CERRIE (2004) ou AGIR (HPA, 2007) nuancent fortement pour leur part les recommandations de laCIPR,etpréconisentlamiseenoeuvred’étudesépidémiologiques,ainsi que le développement de la recherche selon trois axes (effets sanitaires, biocinétique et efficacité biologique relative) pour les différentes formes de tritium. Enfin, dans une perspective de prévention et quelle que soit la perspective adoptée aujourd’hui en radioprotection, il conviendrait de définir, à titre indicatif, des limites dérivées de contamination des aliments et des milieux. 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