Experimental results showed that double coats of carbon and gold on the conductive coating of radiolarite should be used.

通过多次试，放射虫表面导电处理应采用-金双层镀膜法。

In this paper the sample preparation techniques of radiolarite were discussed in order to get high quality secondary electron images in SEM.

讨论了获得放射虫高质量二次电子图像所采用试样制备方法。