title: Radiation field from a rectangular plaque source: critique of some engineering approximations.
abstract: Geometry-dependent effects upon the response of an omnidirectional detector and rectangular source configuration are reviewed. A survey of approximations is conducted and evaluation of regions of validity performed. A variant of the Wallace approximation is shown to produce values that do not vary from "exact" calculations by more than +/- 5%, often yielding results that are within +/- 1%.
authors.affiliation: Commission of the European Communities, Ispra Establishment.
authors.forename: A M
authors.initials: AM
authors.lastname: Ghose
authors.forename: D A
authors.initials: DA
authors.lastname: Bradley
authors.forename: J H
authors.initials: JH
authors.lastname: Hubbell
mesh_terms: D008433:Mathematics; D008962:Models, Theoretical; D011874:Radiometry