uranium thorium concentrations


  • Uranium-Thorium-Lead Isotope Relations in Lunar ... - Science

    The lead isotopic compositions and uranium, thorium, and lead concentrations have been measured on six samples of material from the Sea of Tranquillity. The leads are moderately to very radiogenic; the initial lead concentrations are very low; the uranium and thorium levels are 0.26 to 0.88 and 0.87 to 3.35 parts per million, respectively.

  • Thorium - Wikipedia

    Uranium ores with low thorium concentrations can be purified to produce gram-sized thorium samples of which over a quarter is the 230 Th isotope, ...

  • Thorium, uranium and zirconium concentrations in bauxite

    Twenty-nine samples of bauxites from different locations were analyzed for thorium and uranium by gamma-ray spectrometric, alpha counting, and wet chemical methods. The thorium concentrations range from 5.0 to 131 ppm and average 48.9 ppm. The uranium concentrations range from 2.7 to 26.7 ppm and ...

  • THORIUM, URANIUM AND ZIRCONIUM CONCENTRATIONS …

    Twenty-nine samples of bauxites from different locations were analyzed for thorium and uranium by gamma spectrometric, alpha counting, and wet chemical methods. The thorium concentrations ranged from 5.0 to 131 ppm and averaged 48.9 ppm. The uranium concentrations ranged from 2.7 to 26.7 ppm and ...

  • TENORM: Fertilizer and Fertilizer Production Wastes ...

    Uranium concentrations in phosphate ores found in the U.S. range from 20 - 300 parts per million (ppm) (or 7 - 100 picocuries per gram (pCi/g), which is 0.259 – 3.7 becquerels per gram (Bq/g)). Thorium occurs at essentially background levels, between 1 - 5 ppm (or about 0.1 - 0.6 pCi/g, which is ...

  • Uranium in Drinking-water - WHO

    The first draft of Uranium in Drinking-water, ... For example, uranium concentrations of up to 700 µg/litre have been found in private supplies in Canada ...