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Fig. 3 | EJNMMI Research

Fig. 3

From: ARAS: an automated radioactivity aliquoting system for dispensing solutions containing positron-emitting radioisotopes

Fig. 3

Series of diagrams showing the steps of the two routines applied to dose dispensing for radiochemistry usage. The start calibration protocol is illustrated from a to d: a the initial state of the dispenser, b the pump is actuated until the radioactivity solution reaches the liquid sensor in order to set a reference position, c the pump is again actuated to cover the radiation detector and the measured signal is saved to file, and d the pump is actuated in the reverse direction to move the radioactivity solution to a shielded region behind the reference position. The dispense radioactivity protocol is illustrated in eh: e the pump is actuated to dispense the requested amount of radioactivity; f the stage is raised; g the pump is actuated in the reverse direction to reposition the radioactivity solution again to a shielded region behind the reference position; h after the user vial is removed from the system, a new user vial must be positioned with the stage lowered in order to dispense again

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