@misc{136081, author = {C O\'Brien and P Lamperti and T Williams and Tillman Sander}, title = {Comparison of the NIST and NPL Air Kerma Standards Used for X-ray Measurements Between 10 kV and 80 kV}, year = {2000}, number = {105}, month = {2000-01-01}, publisher = {http://nvl.nist.gov/pub/nistpubs/ Jres/105/5/cnt105-5.htm}, language = {en}, }