Flow cell for radiation detector

A radio-detector system comprising:

• a radio-detector;
• a flow cell comprising a plurality of discreetly-selectable fluid conduits each defining an elongate fluid passageway, wherein each said fluid conduit extends through said flow cell and is positioned in radio communication with said radio-detector;
• and, a valve located upstream of said flow cell which includes an input port and a plurality of output ports, each said output port placed in sealed fluid communication with one end of said fluid conduits, said valve allowing said input port to be placed in fluid communication with a passageway of one or more of said fluid conduits.