Device comprising a capillary tube and a measurement module for estimating an activity of a radioactive liquid

A device configured to measure an activity of a radioactive liquid, the device comprising:

• a detector, which extends around a measurement chamber that is configured to contain the radioactive liquid, the detector being configured to detect ionizing radiation emitted from the measurement chamber and to generate a detection signal dependent on an amount of the detected ionizing radiation;
• and
• processing circuitry, connected to the detector, and programmed to estimate an activity of the radioactive liquid based on the detection signal, wherein:
• the detector comprises:
• a solid-state scintillator detector configured to produce scintillation photons when exposed to ionizing radiation, the solid-state scintillator detector extending around the measurement chamber;
• and
• at least two photodetectors that are optically coupled to the solid-state scintillator detector, each photodetector of the at least two photodetectors being configured to detect scintillation photons and to generate a detection signal dependent on an amount of scintillation photons detected;
• and
• the device further comprises a capillary tube, which extends around a longitudinal axis, and which defines an internal space configured to contain the radioactive liquid, the capillary tube being configured to be placed in a measurement position in which the solid-state scintillator detector extends around the internal space of the capillary tube, the capillary tube forming the measurement chamber.