The beam of a collimator K with a half divergence β/2 = 17,4 × 10–4 rad is limited by a diaphragm Dτ with an opening of 6 mm against which the sample stand is placed. ###>Un collimateur K de demi-divergence β/2 = 17,4 × 10–4 rd est diaphragmé à 6 mm à l’aide du diaphragme Dτ contre lequel se trouve le porte-échantillon.