Seasonal variation of Beryllium-7 relative to Caesium-137 in surface air at tropical and sub-tropical latitudes

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Abstract
A comparative study of the seasonal variations of cosmic-ray produced Be-7 and fission product Cs-137 has been carried out in the surface air at Bombay and other stations in India. The results show that both isotopes attain peak values during the spring months of March-April. However it is observed that the amplitude of increase is much less in the case of Be-7 compared to stratospheric Cs-137. This difference is explained as being due to only a part of Be-7 in surface air being of stratospheric origin. By comparison with Cs-137, it is estimated that the stratospheric component of Be-7 is about 60% in spring decreasing to 25% in the autumn. DOI: 10.1111/j.2153-3490.1970.tb01942.x

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