“…Examples include measuring anthropogenic inputs such as global fallout from nuclear weapons testing [10], routine monitoring of nuclear power reactors [11,12], and assessing emissions from nuclear fuel reprocessing to the local environment [13,14]. As a component of the water molecule, tritium in the environment serves as a tracer to investigate hydrologic processes and LSC has been applied to measurement of tritium in natural waters, including rain, river water, and spring water [3,15,16].…”