| abstract |
Apparatus for monitoring compounds labelled with highly radioactive tritium, <14>C or similar molecules includes a gas-liquid chromatograph column, a variable post-column splitter, a flame ionisation detector connected to receive a minor proportion of the output of the splitter, an ion chamber (10) connected to receive a major proportion of the output of the splitter, a differential electrometer connected to the flame ionisation detector, an electrometer (20) capable of measuring currents of the order of 10<-12> amps at full scale deflection connected to the ion chamber and recording means (16) connected to the electrometers. <IMAGE> |