Development and calibration of a modifiable passive sampler for monitoring atmospheric tritiated water vapor in different environments

•Impacts of HTO sampler configurations on sampling performance were systematically studied.•A modifiable sampler designs were developed for the first time.•Absorption kinetic curves of samplers were calibrated in China and Germany.•A strategy for sampler modification and selection was first proposed.•Custom modification of sampler performance in yet unstudied environments would be enabled.