Uranium, thorium and potassium contents and radioactive equilibrium states of the uranium and thorium series nuclides in phosphate rocks and phosphate fertilizers

Komura, K., Yanagisawa, M., Sakurai, J., & Sakanoue, M. (1985). Uranium, thorium and potassium contents and radioactive equilibrium states of the uranium and thorium series nuclides in phosphate rocks and phosphate fertilizers. Radioisotopes, 34(10), 529–536. https://doi.org/10.3769/radioisotopes.34.10_529