Uranium, Thorium, and Potassium in the Venusian Rocks at the Landing Sites of Vega 1 and 2
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS(1987)
摘要
Concentrations of natural radioactive elements in Venusian rocks at the landing sites of Vega 1 and Vega 2 were determined by gamma ray spectrometers on the landers as follows: Vega 1‐K = (0.45 ± 0.22)%, U = (0.64 ± 0.47) × 10 −4 %, Th = (1.5 ± 1.2) × 10 −4 %; Vega 2‐K = (0.40 ± 0.20)%, U = (0.68 ± 0.39) × 10 −4 %, Th = (2.0 ± 1.0) × 10 −4 %. The abundances of natural radioactive elements in the investigated rocks are similar to that of basic rocks (tholeiitic basalts and gabbros) of the earth's crust. The same conclusion about the type of the rocks at the landing site of Vega 2 was made from the XRF experiment.
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关键词
gamma ray spectrometer,natural radioactivity,chemical composition,potassium
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