Tracks of Cosmic Rays in Plastics

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Science  13 Jan 1967:
Vol. 155, Issue 3759, pp. 187-189
DOI: 10.1126/science.155.3759.187


Cosmic ray nuclei have been observed with the use of plastic trackdetecting solids in satellites and high-altitude balloon flights. Nuclear emulsions in the stacks of plastic sheets allowed the positive identification of cosmic raynuclei as light as nitrogen. The most striking new information was the failure to observe relativistic iron nuclei, a result which has led to an advance in the understanding of track registration criteria.