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- W54299009 abstract "The velocity distribution functions for a mixture of gases are derived for the case when the particle radius is much less than the mean free molecular paths.(J.S.R>) 12475 The birth of a meteorite coincides with the breadup of its parent body and also with the beginning of the meteorite's exposure to cosmic rays. This continued exposure creates, through nuclear evaporation, definitely calculable amounts of He/sup 3/, about 2/) of it by way of tritium. Hence the date of breakup can be obtained from the He/sup 3/ content; or better still, froin the He/sup 3/ and tritium content measured in the same sainple. However the latter method has only limited applicability. The two methods give good accord; of six meteorites dated, all are found to be about 300 million years old. This agreement establishes confidence in the calculations of the He/sup 3/ production rate and leads to some considerations concerning the process of nuclear excitatlon. The age is also in good accord with Opik's calculation of the mean lifetime of meteorite-like bodies against capture by the inner planets. From this agreement conclusions can be drawn concerning the mechaisms of meteorite creation and concerning the relative constancy of cosmic-ray intensity as farmore » back as 300 mfllion years. (auth)« less" @default.
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- W54299009 date "1957-11-01" @default.
- W54299009 modified "2023-09-24" @default.
- W54299009 title "THE THEORY OF THE MOTION OF SMALL AEROSOL PARTICLES IN A DIFFUSION FIELD" @default.
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