A non-surgical method of preparing a dose of a liquid radioactive solution having a desired final level of radioactivity and a final volume comprising the steps of: - determining said desired final level of radioactivity and final volume of the radioactive solution to be produced, - providing a first valve having a waste position and a dosing position - providing a bolus conduit , a waste conduit and a dosing conduit , each conduit having a valve end being connected to said first valve, so that the first valve can establish a waste flow path in the waste position and a dosing flow path in the dosing position, the dosing flow path being different from said waste flow path, the bolus conduit comprising a measuring section and an internal volume, - arranging said first valve in the waste position, - transporting a first amount of said radioactive solution through said waste flow path, the first amount of said radioactive solution having an initial level of radioactivity that is at least approximately equal to or higher than the desired final level of radioactivity and an initial volume that is larger than the internal volume of said bolus conduit, - providing a radiation detector , the radiation detector being operable to measure a level of radioactivity of the radioactive solution in said measuring section, - measuring a reference level of radioactivity of said radioactive solution present in said measuring section, characterized in that the internal volume of the bolus conduit is approximately equal to the desired final volume of the radioactive solution, and in that when the reference level of radioactivity is approximately equal to an pre-final level of radioactivity, the method further comprises the steps of: - arranging the first valve in the dosing position, and - transporting the radioactive solution present in the bolus conduit through the dosing flow path, so that the radioactive solution has the desired final level of radioactivity when said radioactive solution reaches the end of the dosing flow path. - determining said desired final level of radioactivity and final volume of the radioactive solution to be produced, - providing a first valve having a waste position and a dosing position - providing a bolus conduit , a waste conduit and a dosing conduit , each conduit having a valve end being connected to said first valve, so that the first valve can establish a waste flow path in the waste position and a dosing flow path in the dosing position, the dosing flow path being different from said waste flow path, the bolus conduit comprising a measuring section and an internal volume, - arranging said first valve in the waste position, - transporting a first amount of said radioactive solution through said waste flow path, the first amount of said radioactive solution having an initial level of radioactivity that is at least approximately equal to or higher than the desired final level of radioactivity and an initial volume that is larger than the internal volume of said bolus conduit, - providing a radiation detector , the radiation detector being operable to measure a level of radioactivity of the radioactive solution in said measuring section, - measuring a reference level of radioactivity of said radioactive solution present in said measuring section, characterized in that the internal volume of the bolus conduit is approximately equal to the desired final volume of the radioactive solution, and in that when the reference level of radioactivity is approximately equal to an pre-final level of radioactivity, the method further comprises the steps of: - arranging the first valve in the dosing position, and - transporting the radioactive solution present in the bolus conduit through the dosing flow path, - arranging the first valve in the dosing position, and - transporting the radioactive solution present in the bolus conduit through the dosing flow path, <EOS>