@misc{indiciaee93b1e6d6f13,
  title = {Direct radiometric measurement by gamma-ray scintillation spectrometer: Part I: Uranium And Thorium Series In Equilibrium},
  year = {1956},
  doi = {10.1130/0016-7606(1956)67[395:drmbgs]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70216325},
  note = {Source identifier: 70216325}
}