目标反向散射讯号 target backscatter
反向散射杂波讯号 backscatter clutter
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可是长期以来都认为它的背底较重，能掩盖小角散射的讯号而未能普遍应用。
But for a long time it has not been used widely, because it has comparatively strong background which may cover the signal of SAXS.
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