Measurement of Tritium Concentration in Rainwater Associated with Thunderstorms in Baghdad City

Abstract

The study examined the effect of thunderstorms on increasing the concentration of Tritium (3H) in rainwater for periods of time within the 2018-2019 rain season, as it is considered one of the most important environmental radioisotopes used in hydrological studies, specifically in estimating modern water ages. Measurements were performed with a liquid scintillation counter. The Tritium concentration values showed a noteworthy variation in their values. The highest values were recorded in February and March of 2019 (8.57 and 11.71 TU) respectively. While the results recorded during December 2018 was 4.48 TU and for January 2019 was 3.22 TU, these were the least concentration. The reason for the increase in the values of Tritium concentration is due to the fact that the samples were taken from the rain that was accompanied by thunderstorms and the relative rise in temperatures in the months of February and March of 2019, as they ranged between (20-22 ° C) compared to the temperatures that ranged between (8-11 ° C) during months December and January of 2019 respectively, and the rain was not accompanied by thunderstorms. The distribution of rain samples on the Local Meteoric Water Line was studied by measuring the concentrations of stable isotopes (Deuterium and Oxygen-18) and found that their distribution within the local and global meteoric water line (LMWL) and (GMWL). The importance of this research lies in studying the effect of thunderstorms on the concentration of an isotope Tritium in rainwater, as it is considered one of the main sources for this isotope.