Background: 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 ?en 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.