X-ray study of forensic samples at the SPring-8

Abstract. The capability of synchrotron radiation (SR) is demonstrated by its new applications in the field of criminal investigation. X-ray fluorescence spectrometry with SR provides very high signal-to-noise ratios and showed concentration profiles of trace elements in forensic samples such as illegal drugs and automobile coating chips. The profiles are so unique as to be called “chemical fingerprints” and have become valuable information to investigative authorities. Also, x-ray refraction contrast imaging technique reveals specific structures of materials that can be never observed by optical examination. Such new techniques with SR are making an innovation in police investigations.