Monitoring of Tritium concentration in precipitation during the period from 2011 to 2016


Tritium 3H (T) is a radioisotope of hydrogen and a component of the water molecule (HTO). It is a marker for reservoirs such as the stratosphere, troposphere, and oceans involved in the hydrological cycle. Tritium monitoring is an essential research tool in hydro-climate, dating for water and recharge groundwater. The Isotope Hydrology Laboratory belongs to the Institute for Nuclear Science and Technology has collected monthly precipitation samples in Hanoi for tritium concentration analysis. The monthly tritium concentrations in precipitation in the city from 2011 to 2016 reached a maximum of 7.07 Tritium Units (TU) in August 2011. The mean annual tritium concentration stabilized from 2.03 to 3.36 TU. It suggests that tritium in monitoring station precipitation is predominantly natural. The distribution of tritium concentrations is represented on a histogram and can be approximated by a Gaussian distribution and frequency curve has R2 of 0.94 with P < 0.0002. The seasonal variation of tritium concentration in rainwater largely reflects the different sources and transport patterns of moisture. Precipitation in Hanoi is deeply affected by the moisture from the sea so it was less pronounced stratosphere – to- troposphere exchange tritium. Besides, no correlation was found between tritium concentrations and monthly precipitation amount with R2 = 0.03 and P value is 0.123.


These results have been published in The Journal of Environmental Radioactivity 192 (2018) 143-149  (ISI);


Statistical distribution and seasonal trends of tritium concentration in Hanoi’s precipitation


Lan Anh – Isotope Hydrology Laboratory

Institute for Nuclear Science and Technology