Tritium-in-air bubbler samplers have been used extensively at the UKAEA Culham-JET facilities to monitor airborne tritium contamination in a wide variety of locations, from inside the torus to analysis laboratories. The samplers exploit the isotopic exchange between tritiated water vapour in the environmental air and analar water in a twin stage bubbler system to derive the concentration of tritium in the workplace air. These samplers give consistent results down to a few 10's of Bq's/m3 of air and they can be left to run unattended for long periods of time. Theoretically there should be a correlation between an individual's exposure to tritium-in-air and the resulting tritium-in-urine measurements that are used to derive the internal doses. This paper sets out to examine, using data routinely collected by sampler operation and bioassay measurements, whether this correlation exists and to discuss the findings.