Translate the following English sentence to French:
"I believe this is a document well worth reading. In connection with the monitoring of radioactivity levels, I ought to say that Portugal and Spain have already submitted what are to all intents and purposes their final measurements."
Je dois également vous dire qu'en ce qui concerne le contrôle des niveaux de radioactivité, tant le Portugal que l'Espagne ont déjà fourni leurs mesures pratiquement définitives.