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    National Tsing Hua University Institutional Repository > 原子科學院  > 工程與系統科學系 > 會議論文  >  Renovation of epithermal neutron beam for BNCT at THOR

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/47193

    Title: Renovation of epithermal neutron beam for BNCT at THOR
    Authors: Liu,Y. -W H.;Huang,T. T.;Jiang,S. H.;Liu,H. M.;Yen-Wan Hsueh
    教師: 薛燕婉
    Date: 2004
    Publisher: Elsevier
    Relation: Applied Radiation and Isotopes, Elsevier, Volume 61, Issue 5, November 2004, Pages 1039-1043
    Keywords: Medical imaging
    Neutron beams
    Optical collimators
    Abstract: Heading for possible use for clinical trial, THOR (Tsing Hua Open-pool Reactor) at Taiwan was shutdown for renovation of a new epithermal neutron beam in January 2003. In November 2003, concrete cutting was finished for closer distance from core and larger treatment room. This article presents the design base that the construction of the new beam is based on. The filter/moderator design along the beam is Cd(0.1cm)+Al(10cm)+FLUENTAL [trademark] (16cm)+Al(10cm) +FLUENTAL(24cm)+Void(18cm)+Cd(0.1cm)+Bi(10cm) with 6cm Pb as reflector. Following the filter/moderator is an 88cm long, 6cm thick Bi-lined collimator with Li2CO3-PE at the end. The collimator is surrounded by Li2CO3-PE and Pb. The calculated beam parameters under 2MW at the beam exit is φepi=3.4×109n/cm 2/s, Df/φepi=2.8×10 -11cGycm2/n, Dγ/φepi=1. 3×10-11cGycm2/n, and J+/φ=0.8. For a phantom placed 10cm from beam exit, MCNP calculation shows that the advantage depth is 8.9cm, and advantage ratio is 5.6 if boron concentration in tumor and normal tissue are assumed to be 65 and 18ppm. The maximum dose rate for normal tissue is 50cGy/min. The maximum therapeutic ratio is 6. The construction of the beam is scheduled to be finished by the end of April 2004. © 2004 Elsevier Ltd. All rights reserved.
    URI: http://www.elsevier.com/
    Appears in Collections:[工程與系統科學系] 會議論文

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