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CARACTÉRISTIQUES DE LA GRILLE Distance focale ou distance de ___________-c'est la distance ____-_______Facteurs N:-c'est le _______ de lames par unité de distance (cm)-caractérise l'___________ de la grille -N=1/(D+d)Rapport de grille:-détermine l'efficacité de la grille -dépend de hauteur des lames et distance entre 2 lames de plombs D: R=h/D (la grille sera d'autant plus _________ que le rapport sera élevé)Facteurs BUCKY:-Facteur par lequel il faut _________ les mAs (la charge) pour compenser l'atténuation du rayonnement primaire dû à la grille Sélectivité:-représente le rapport de la transmission du rayonnement primaire qui passe au travers de la grille et la transmission du rayonnement diffusé qui a traverse -S=T/T' -En pourcentage, plus S augmente et plus la qualité de l'image ______

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