Lemelle, Laurence and Simionovici, Alexandre and Susini, Jean and Oger, Phil and Chukalina, Marina and Rau, Christoph and Golosio, Bruno and Gillet, Philippe (2003) X-ray imaging techniques and exobiology. Journal de physique. IV, Vol. 104 , p. 377-380. ISSN 1155-4339. Article.
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X-ray imaging techniques at the best spatial resolution and using synchrotron facilities are put forth as powerful techniques for the search of small life forms in extraterrestrial rocks under quarantine conditions. Absorption and fluorescence X-ray microtomographies on sub-millimeter silicate assemblages inside a container reveal the mineralogical microenvironments were life should be looked for in priority. Limitations with respect to bacterial detection are due to the difficulties to obtain information about light elements (Z ≤ 14), major constituents of biological and silicate samples. The X-ray signature of a "present" bacteria on a silicate surface was defined by X-ray mapping, out of a container, as coincident micrometer and oval zones having strong P and S fluorescence lines (S-fluorescence being slightly lower than P-fluorescence) and an amino-linked sulfur redox speciation. The detection of a single cell along with new procedures to calculate tomographic views will allow considerable improvements of 3D detection of life by X-ray techniques.
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