Concentrations of uranium, thorium and rare earth elements (REE) in 36 species of ectomycorrhizal (26 samples) and saprobic (25 samples) macrofungi from unpolluted sites with differing bedrock geochemistry were analyzed by inductively coupled plasma …

Uranium and thorium concentrations, weight ratios, and isotope activity ratios are shown in table 1 for the samples analyzed. 3. DISCUSSION The distribution of uranium and thorium isotopes varies with both sediment size fraction and geographic location of samples. Because of the many complex variables in the weathering process, it is difficult ...

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 averaged 11.4 ppm.

The uranium concentration is just outside the range reported and differs from the mean by 12%. 3. Results and discussion The results for uranium and thorium isotopes for the foram and clay samples are presented in Table 4. The clay present during dissolution of the calcite samples made some contribution to the measured uranium.

The thorium concentration differed only marginally with respect to age group, indicating that its behavior in the body could be age-independent. Conversely, the uranium level in bones was found to change for the age groups tested, an indication of age-specific deposition.

Uranium-238 and thorium-232 series concentrations in soil, radon-222 indoor and drinking water concentrations and dose assessment in the city of Aldama, Chihuahua, Mexico J Environ Radioact . 2004;77(2):205-19. doi: 10.1016/j.jenvrad.2004.03.008.