@misc{indiciae7e3891190b96,
  title = {Scintillation detectors in gamma spectral logging; geometry, absorption and calibration},
  author = {Ulrich Schimschal},
  year = {1980},
  doi = {10.3133/ofr80688},
  url = {https://pubs.usgs.gov/publication/ofr80688},
  note = {Source identifier: ofr80688}
}