Abstract
In the present R&D, multi-gap resistive plate chambers (MRPCs) are studied for photon non-destructive inspection of small airport baggages and cargos. Six-gap RPCs for line-scan operations are constructed with soda-lime glass with a thicknesses of 0.53 mm. The typical detector characteristics such as the operation high voltage (HV), the efficiency, and the strip multiplicity are measured by using 661.7 keV photons emitted from a 137Cs source with a current activity of 4.74 GBq. The efficiency for the 661.7 keV photons measured by the MRPC detector at the HV applied to obtain the photon-transmission images is 5.5%, which is about 84% of that predicted by a GEANT simulation. To demonstrate the quality operation of the MRPC detectors, we conduct line-scan operations for various objects and produce the photon-transmission images that barely identify 2 mm-thick stainless steel objects when measured with a color depth (contrast) of the image pixels of about 100.
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