“…Tritium-and deuterium-substituted methanes may also be separated using a 1520 cm., highly active charcoal column (194) , while monotritiated positional isomers of olefinic hydrocarbons were separated by Lee and Rowland (399) on a 160-ft. column containing an ethylene glycol-AgX03 mixture as liquid phase. Further studies on the separation of the six hydrogen isotopic species were reported (199,656) using columns of ferric oxidecoated alumina. An apparatus for automatic continuous measurement of the C14 radioactivity in the effluent of GC columns was described (1.49, 621) as was a flow Geiger-Mueller counter which was operated in a temperature range of 30' to 180 ' C. and used for the analysis of tritium and Cltlabeled organic compounds in a manner such that both the quantity and the activity of each component could be recorded simultaneously (550,551).…”