... 源与侦检器距离 separation,sourcedetector 源与胶片距离 source to film distance 源中子 neutron, source ...
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Then, exposure conditions including the exposure dose and source to film distance were changed to find the optimal one.
改变源片距离和曝光剂量,进一步突出所能发现的误差,确定最佳曝光条件;
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