The determination of tritium as water vapour in a Geiger-Mullar counter

摘要

The concentration of tritium in water and in heavy mater has been determined by the method due to Cameron. Tritiated water vapour is mixed with the filling ga3 of a Geiger-Muller counter.nA concentration of 0.02 µc/g of tritium as HTO can be determined with an accuracy of better than 10% in a counting period of 60 mins. The system is calibrated using a standard solution of tritium in light water:the limitations of the system as an absolute method are considered.nIn the case of tritium in heavy water, there is some additional error due to uncertainty in isotopic fractionation.