Radiation detector

A radiation detector, characterised in that it comprises (A) a plurality of ionisation chambers (10) and (B) an electronic circuit, wherein each of the ionisation chambers (10) contains a measuring gas and comprises a main body (11), wherein the plurality of ionisation chambers (10) are arranged in such a way that the main bodies (11) (a) define a wall which surrounds a measurement space (M) or (b) form two parallel rows between which is the measurement space (M);

• wherein the measurement space (M) is configured and sized and sufficiently small that the measurement space (M) can effectively receive a single syringe or vial or other container configured and sized to receive a predetermined dose of a radiopharmaceutical liquid to be administered to a single human patient with the single syringe or vial or other container being located sufficiently close to the main bodies (11) forming the measurement space (M) that the level of radiation emitted by the predetermined dose can be effectively measured by the radiation detector;
• wherein the electronic circuit is configured to detect the total ionisation of the measuring gas contained in the plurality of ionisation chambers (10), said radiation detector being configured and effective for detecting and determining the level of radiation emitted by the predetermined dose of the radiopharmaceutical liquid.