ABSTRACTConventional radiography, xeroradiography, tomography and contrast enhancement were applied to the study of thinly laminated sediments from Lake Valkiajärvi, Finland. Conventional radiography provides satisfactory contrast when the sediment sample is thin, and tomography gives better results in the study of thick unextruded sediment cores, while xeroradiography and contrast enchancement did not essentially improve poor radiographic contrast in the present experiments. Examples are given of radiographs of thin laminae and of microdensitometer curves obtained from these.