Study of the response of plastic scintillation detectors in small-field 6 MV photon beams by Monte Carlo simulations

被引:33
|
作者
Wang, Lilie L. W. [1 ]
Beddar, Sam [1 ]
机构
[1] Univ Texas MD Anderson Canc Ctr, Dept Radiat Phys, Houston, TX 77030 USA
关键词
plastic scintillation detectors; small-field photon beams; Monte Carlo simulations; CERENKOV RADIATION; NONSTANDARD FIELDS; DOSIMETRY; ENERGY; ELECTRON; SYSTEM;
D O I
10.1118/1.3554644
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Purpose: To investigate the response of plastic scintillation detectors (PSDs) in a 6 MV photon beam of various field sizes using Monte Carlo simulations. Methods: Three PSDs were simulated: A BC-400 and a BCF-12, each attached to a plastic-core optical fiber, and a BC-400 attached to an air-core optical fiber. PSD response was calculated as the detector dose per unit water dose for field sizes ranging from 10 x 10 down to 0.5 x 0.5 cm(2) for both perpendicular and parallel orientations of the detectors to an incident beam. Similar calculations were performed for a CC01 compact chamber. The off-axis dose profiles were calculated in the 0.5 x 0.5 cm(2) photon beam and were compared to the dose profile calculated for the CC01 chamber and that calculated in water without any detector. The angular dependence of the PSDs' responses in a small photon beam was studied. Results: In the perpendicular orientation, the response of the BCF-12 PSD varied by only 0.5% as the field size decreased from 10 x 10 to 0.5 x 0.5 cm(2), while the response of BC-400 PSD attached to a plastic-core fiber varied by more than 3% at the smallest field size because of its longer sensitive region. In the parallel orientation, the response of both PSDs attached to a plastic-core fiber varied by less than 0.4% for the same range of field sizes. For the PSD attached to an air-core fiber, the response varied, at most, by 2% for both orientations. Conclusions: The responses of all the PSDs investigated in this work can have a variation of only 1%-2% irrespective of field size and orientation of the detector if the length of the sensitive region is not more than 2 mm long and the optical fiber stems are prevented from pointing directly to the incident source. (C) 2011 American Association of Physicists in Medicine. [DOI: 10.1118/1.3554644]
引用
收藏
页码:1596 / 1599
页数:4
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