title: Comparison of the NIST and NPL Air Kerma Standards Used for X-Ray Measurements Between 10 kV and 80 kV.
abstract: A direct comparison was made between the air kerma primary standards used for the measurements of low-energy x rays at the National Institute of Standards and Technology (NIST) and the National Physical Laboratory (NPL). The comparison was conducted at the NPL using NPL reference radiation qualities between 10 kV and 80 kV. The results show the primary air-kerma standards to agree within 0.6 % of their values for beam qualities up to 80 kV.
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD, 20899-8460, USA.
authors.forename: M
authors.initials: M
authors.lastname: O'Brien
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD, 20899-8460, USA.
authors.forename: P
authors.initials: P
authors.lastname: Lamperti
authors.affiliation: National Physical Laboratory, Teddington, Middlesex, UK.
authors.forename: T
authors.initials: T
authors.lastname: Williams
authors.affiliation: National Physical Laboratory, Teddington, Middlesex, UK.
authors.forename: T
authors.initials: T
authors.lastname: Sander
keywords: air kerma; free-air ionization chamber; primary standard; reference radiation qualities