Mathematics

Findings from S.D Egbert et al in Mathematics Reported

  2012 APR 17 - (VerticalNews.com) -- A report, "The 2002 dosimetry system (DS02) and available fluences for organ dose calculations," is newly published data in Radiation Protection Dosimetry. According to the authors of recent research from San Diego, California, "The A bomb dosimetry system (DS) calculates each survivor's organ doses. It does this by calculating the angular fluences incident on each survivor."

  "These are used with humanoid phantom shielding calculations to estimate organ doses in 15 organs, 3-sized phantoms, 2 sexes and 2 postures at any orientation or distance to the bomb. The DS has been re-used and updated several times. Currently, efforts are being considered to include shielding for additional organs by adding additional phantoms. The DS has gone through a series of upgrades referred to as: DS84, DS86, DS86R, DS93, DS02. DS86 and DS02 were approved and installed at Radiation Effects Research Foundation. The system uses free-field energy-angular fluence from a discrete ordinate calculation coupled with Monte Carlo adjoint-shielding histories. This paper briefly discusses the adjoint Monte Carlo; combinatorial shield geometry for the phantom, house, factory, and terrain; modifications to use fictitious scattering in voxel phantoms; the adjoint source energy, angle and location distribution; 'leakage histories' and their optimisation for dose or fluence; doubly differential (energy-angle) coupling for single-, double-, or triple-shielding coupling; output of various components of dose and energy-angular fluences; survivor-specific inputs; organ dose uncertainty; and testing, benchmarking and extended applications," wrote S.D Egbert and colleagues.

  The researchers concluded: "Also, approaches to add additional organ-shielding calculations to DS02 are discussed."

  Egbert and colleagues published their study in Radiation Protection Dosimetry (The 2002 dosimetry system (DS02) and available fluences for organ dose calculations. Radiation Protection Dosimetry, 2012;149(1):21-7).

  For additional information, contact S.D. Egbert, Science Applications International Corporation, 10260 Campus Point Dr, San Diego, CA 92121, United States.

  Publisher contact information for the journal Radiation Protection Dosimetry is: Oxford Univ Press, Great Clarendon St, Oxford OX2 6DP, England.

  Keywords: City:San Diego, State:California, Country:United States, Region:North and Central America, Mathematics.

  This article was prepared by VerticalNews Mathematics editors from staff and other reports. Copyright 2012, VerticalNews Mathematics via VerticalNews.com.