@misc{54791,
  author = {Stephen Seltzer},
  title = {Calculations of Fluence Rates of Unscattered X- and Gamma-Ray Photons Emerging From Model Spheres of Special Nuclear Material},
  year = {2009},
  number = {7557},
  month = {2009-11-30},
  publisher = {NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=901131},
  language = {en},
}