@misc{indiciae9291d4f44c9c,
  title = {Calibration for inhaled radioactive material using a point source.},
  author = {R B Falk},
  year = {1974},
  doi = {10.1097/00004032-197412000-00003},
  url = {https://pubmed.ncbi.nlm.nih.gov/4436062/},
  note = {Source identifier: 4436062}
}