Measurements of short-lived cosmogenic nuclides in rain sample. Journal of Radioanalytical and nuclear chemistry 269

Extremely low activity levels of cosmic ray induced nuclides have been measured in freshly precipitated rainwater by quick chemical separation coupled with ultra low background gamma spectrometry. The nuclides detected were 38S (half-life = 2.83 h)-38Cl (37.2 m), 39Cl (55.6 m), 18F (109.7 m), 24Na (14.96 h), 28Mg (20.9 h), 7Be (53.3 d) and 22Na(2.602 y). Number of atoms in rain water were evaluated to be ranging from 400~1900 L-1 for 39Cl (n=6, mean