@misc{indiciaeec80eb391512,
  title = {A simple, efficient beta ray counter for liquid samples.},
  author = {R G CHAPMAN},
  year = {1958},
  doi = {10.1152/jappl.1958.13.3.525},
  url = {https://pubmed.ncbi.nlm.nih.gov/13587446/},
  note = {Source identifier: 13587446}
}