Figure 3.

Detector sensitivity (cps/Bq) evaluated along a line parallel to the x axis (see reference system defined in Figure 2) passing through the center of the detector at $z=15$ mm, where $x=50$ mm represents the coordinate of the center of the detector (left), and along the z axis also passing though the center of the detector, where the z coordinates stand for the distance from the source to the collimator (right). The blue doted curve represents the linear motion, the red solid curve stands for circular motion without overlapping and orange dashed curve represents circular motion with overlapping.