中文摘要：

通过对塑料闪烁光纤阵列在一定能量范围X射线的研究，分析了利用闪烁光纤阵列作为工业成像探测器的一些传输特性。采用基于蒙特卡罗（MCNP）的模拟方法，分析了闪烁光纤在各种射线能量和强度下的信息，并且模拟计算了表征图象质量的信噪比（SNR）、探测量子效率（DQE）以及探测效率（DE）。

英文摘要：

Plastic scintillating fiber is a common imaging detector in the field of industrial CT and Digital Radiography （DR） imaging. Because of lack of detailed theoretical guidance and experiment data, the practical works are still going on to perfect detector design and optimization. Purpose： The purpose is to track the interaction of incident particle with scintillating fiber, obtain the fiber transmission properties of the incident particles with different energies and intensities, and provide theoretical basis for optimization design of imaging detector. Methods： We studied the fundamental information transmission character of the plastic scintillating fiber （PSF） linear array, which is an imaging detector for industrial purpose in some X-rays energy range. Results： By using Monte Carlo simulation method, we analyzed the responses of the PSF array under various low energies and luminosities of X-rays, and evaluated the Signal to Noise Ratio （SNR）, Detector Quantum Efficiency （DQE） and Detector Efficiency （DE）, which described the image quality of the PSF array detector. Conclusions： From the simulation results, we obtained the following three conclusions： （1） If the incident photons are of low energy and high intensity, the DQE of PSF and the obtained contrast of image would be better. （2） The DE of scintillating fiber generally goes down with the increment of incident energy, except in the middle energy region （about 60 keV） where DE goes up with the energy increment due to the influence of the /Zen value of the scintillating fiber material. （3） Because DE of scintillating fiber is low and the output visible photon number is small, which is fixed by the fiber characteristics itself, image intensifier must be added to detector system to enhance the image signal when scintillating fiber is used for image detector.