@misc{indiciaef676226eb6da,
  title = {Electron contamination from photon beam collimators.},
  author = {B Nilsson and A Brahme},
  year = {1986},
  doi = {10.1016/s0167-8140(86)80053-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/3085172/},
  note = {Source identifier: 3085172}
}