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Origin and Nature of Heavy Ionization Particles Detected on Photographic Plates Exposed to Cosmic Rays

Nature volume 147, pages 240–241 (1941)Cite this article

Abstract

IN a previous communication1 we gave an account of star-like tracks obtained in vertically placed Ilford Halftone plates exposed to cosmic rays at Sandakphu (3660 m.) and Darjeeling (2130 m.). We suggested that they were due to secondary mesotrons. Since then we have carried out a more detailed examination of these plates and also of other similar plates kept at Sandakphu for 202 days (i) under 20 cm. of water in a galvanized iron box, (ii) in a lead box with 5·5 cm. lead on the top of the vertically placed plates. The last-named plates on development were found to be fogged. Fortunately, the observations of Heitler and his co-workers2 on similar plates exposed under different thicknesses of lead at Jung-fraujoch supplement our observations and are in agreement with our results.

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References

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Authors and Affiliations

  1. Bose Institute, 93 Upper Circular Road, Calcutta

    D. M. BOSE & BIVA CHOWDHEY

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  1. D. M. BOSE
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  2. BIVA CHOWDHEY
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BOSE, D., CHOWDHEY, B. Origin and Nature of Heavy Ionization Particles Detected on Photographic Plates Exposed to Cosmic Rays. Nature 147, 240–241 (1941). https://doi.org/10.1038/147240a0

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