HTO monitoring using heated ion chambers

The viability of using a bakeable, one litre, in-line process ion chamber tritium monitor for the detection of HTO in one atmosphere streams is demonstrated. Reproducible and reliable measurement of HTO is achieved primarily by holding the tritium monitor at an elevated temperature of 100°C and by maintaining a relative humidity of as low as 1% (at room temperature). The flow dependence of the one litre tritium monitor is examined at flow rates up to 2 L s^-1 and elemental tritium concentrations as high as 50 Ci m^-3