Thumbnail
Access Restriction
Open

Author Kellerer, A. M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY ♦ PROPORTIONAL COUNTERS ♦ GEOMETRY ♦ CYLINDERS ♦ DOSE EQUIVALENTS ♦ INTEGRALS ♦ LET ♦ MICRODOSIMETRY ♦ SPHERES ♦ DOSIMETRY ♦ ENERGY TRANSFER ♦ MATHEMATICS ♦ MEASURING INSTRUMENTS ♦ RADIATION DETECTORS ♦ Radiation Instrumentation- Radiation Dosemeters
Abstract The proximity functions, or the closely related geometric reduction factors, of cylinders and spheres are compared in order to assess the degree of equivalence that can be achieved if cylindrical microdosimetric detectors are substituted for spherical instruments. Equality of the dose mean energy imparted per event, anti epsilon/sub D/, is chosen as a criterion for equivalence. A cylinder of height and diameter equal to 0.895 d is found to be closely equivalent to the sphere of diameter d. The equivalence is largely preserved even if the radiation is unidirectional and perpendicular to the axis of the cylinder. The equivalence does not pertain to the frequency mean energy imparted per event, anti epsilon/sub F/, or to the event frequencies, PHI, per unit absorbed dose. Cubes are also considered, since they are occasionally invoked in microdosimetric computations. One finds that a cube of side length 0.837 d is most closely equivalent to a sphere of diameter d. The quantity anti epsilon/sub D/ for the cube cannot differ by more than 4% from the value of the sphere.
Educational Use Research
Learning Resource Type Article
Publisher Date 1981-05-01
Publisher Place United States
Journal Radiat. Res.
Volume Number 86
Issue Number 2
Organization Universitaet Wuerzburg, Germany


Open content in new tab

   Open content in new tab