The backscattering detector is positioned at the front of the collimating element while the transmission detector is arranged opposite the backscattering detector.
所述的 背散射探测器设置于所述准直器的前面，所述的透射探测器设置于所述背散射探测器的对面；
The backscattering detector is positioned at the front of the collimating element while the transmission detector is arranged opposite the backscattering detector.
所述的 背散射探测器设置于所述准直器的前面，所述的透射探测器设置于所述背散射探测器的对面；
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