title: [Separation of HT and HTO in the atmosphere with porous Vycor glass tube].
abstract: The continuous selective monitoring of tritium gas (HT) in the air containing HT and tritiated water vapor (HTO) was investigated by using the separation cell made of porous Vycor glass tube. On admitting the air containing HT or HTO into the separation cell, HT permeated immediately through the Vycor tube depending on the partial pressure, however, HTO permeated very slowly through the Vycor tube after initial induction period. The initial induction period was elongated with a rise of the temperature of separation cell and then the permeability of HTO decreased remarkably. In the air containing HT and water vapor, the permeation of HT through the Vycor tube was considerably restricted by the water vapor adsorbed on the Vycor tube at lower temperature (at 25 degrees C) but it was hardly affected by water vapor at higher temperature (greater than 50 degrees C) since water vapor was difficult to adsorb on the Vycor tube. These results indicated that HT in the air containing HT and water vapor can be continuously monitored by using the separation cell made of the porous Vycor glass tube.
mesh_terms: D000393:Air Pollutants / Q000302:isolation & purification*; D000396:Air Pollutants, Radioactive / Q000302:isolation & purification*; D005740:Gases; D005898:Glass; D011834:Radiation Monitoring / Q000295:instrumentation* / Q000379:methods; D013696:Temperature; D014316:Tritium / Q000302:isolation & purification*
chemical_list: D000393:Air Pollutants; D000396:Air Pollutants, Radioactive; D005740:Gases; D014316:Tritium