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- W2106585149 abstract "The radioactivities of 37Ar (35-day half-life) and 39Ar (270-year half-life) were measured in the separated iron phase and in whole-rock samples of the Lost City meteorite. Two samples of magnetic phase were dissolved in acid, thus releasing the argon radioactivities. Those radioactivities were concordant. After the calcium and potassium contributions to the argon radioactivities were removed, the average values of the 37Ar and 39Ar from the iron and nickel at the time of fall were 11.7±0.9 dpm/kg and 24.6±0.9 dpm/kg, respectively, and the 37Ar/39Ar ratio for the iron and nickel was 0.48±0.04. This low 37Ar/39Ar ratio cannot be explained solely by the modulation of cosmic rays at the time of fall. Since the orbit of the Lost City meteorite is known, the 37Ar/39Ar ratio can be interpreted in terms of a variation in the cosmic-ray flux along its orbit. A positive radial gradient for the flux of cosmic rays of energies greater than 400 Mev is required. The gradient is (62±17)% per AU for the long-term (∼500 year) average flux. In the whole rock, the tritium and argon radioactivities were measured as a function of depth along a 10.0-cm bar. The tritium varied from a maximum of 358±5 dpm/kg to a minimum of 260±10 dpm/kg. The tritium activities, together with the low 60Co activity, indicate that between 4 and 11 cm of material was ablated from one end of the bar, and between 10 and 23 cm of material was ablated from the other end." @default.
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- W2106585149 date "1971-06-10" @default.
- W2106585149 modified "2023-10-17" @default.
- W2106585149 title "Radial gradient of cosmic rays from the Lost City meteorite" @default.
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- W2106585149 doi "https://doi.org/10.1029/jb076i017p04127" @default.
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