@inproceedings{f676c7cf1205406bbce0ea3ff0fe1786,
title = "Coarse-mesh adjoint biasing of a Monte Carlo dose calculation",
abstract = "Deep penetration radiation transport calculations have been performed to determine the dose rates at a positron emission tomography (PET) facility in China. The radiation source is a cyclotron that is used for the production of the PET isotopes, with a labyrinthine concrete wall arrangement to minimize dose to operation personnel. Since directionally biased Monte Carlo calculations did not reach an acceptably low standard error after a week of CPU time, approximate adjoint fluxes were calculated for each of four detector locations using coarse-mesh adjoint discrete ordinates calculations and were used to bias the Monte Carlo calculations. This biasing resulted in improved computational efficiency of a factor of one to three orders of magnitude. This result shows the value of even approximate adjoint flux biasing to speed up Monte Carlo calculations. Copyrighl",
keywords = "Adjoint biasing, Discrete ordinates, Isotope production, Monte Carlo",
author = "Pevey, {R. E.} and Miller, {L. F.} and Marshall, {W. J.} and Townsend, {L. W.} and B. Alvord",
year = "2006",
doi = "10.1520/stp45451s",
language = "English",
isbn = "9780803134126",
series = "ASTM Special Technical Publication",
publisher = "ASTM International",
pages = "252--260",
booktitle = "12th International Symposium on Reactor Dosimetry",
note = "12th International Symposium on Reactor Dosimetry ; Conference date: 08-05-2005 Through 13-05-2005",
}