Cerenkov light spectrum in an optical fiber exposed to a photon or electron radiation therapy beam
Cerenkov light spectrum in an optical fiber exposed to a photon or electron radiation therapy beam
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DOI：
10.1364/ao.48.003362
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发表时间：
2009-06-20
期刊：
影响因子：
1.9
通讯作者：
Suchowerska, Natalka
中科院分区：
文献类型：
--
作者：
Lambert, Jamil;Yin, Yongbai;Suchowerska, Natalka
当高能带电粒子进入光纤芯时，会产生切伦科夫信号。切伦科夫强度可以大到足以干扰通过光纤传输的信号。我们确定的切伦科夫背景信号的光谱中产生的聚（甲基丙烯酸甲酯）光纤暴露于光子和电子治疗束从直线加速器。该光谱测量与从背景中辨别信号有关，如在使用光纤读出的闪烁剂量测定中。我们发现，经过对光纤的波长相关衰减进行校正后，光谱近似于理论曲线。光谱并不显著地取决于辐射光束和光纤的轴之间的角度，而是取决于光纤暴露于光束的水中深度。(C)2009年美国光学学会
A Cerenkov signal is generated when energetic charged particles enter the core of an optical fiber. The Cerenkov intensity can be large enough to interfere with signals transmitted through the fiber. We determine the spectrum of the Cerenkov background signal generated in a poly(methyl methacrylate) optical fiber exposed to photon and electron therapeutic beams from a linear accelerator. This spectral measurement is relevant to discrimination of the signal from the background, as in scintillation dosimetry using optical fiber readouts. We find that the spectrum is approximated by the theoretical curve after correction for the wavelength dependent attenuation of the fiber. The spectrum does not depend significantly on the angle between the radiation beam and the axis of the fiber optic but is dependent on the depth in water at which the fiber is exposed to the beam. (C) 2009 Optical Society of America