Analyzes sediment at crime scenes and contributes to investigations, develops national sediment database Tokyo University of Science-University Journal Online

　Tokyo University of Science and the High-Brightness Photon Science Research Center have developed the "Japan National Sediment Database" that can estimate the origin of unknown sediment when applied to forensic science.By identifying the production area of the earth and sand left at the crime scene, it is expected that the investigation ability can be greatly enhanced and it will be useful for the prevention of the damage caused by the crime.The research results were published in the scientific journal "Progress in X-ray analysis".

　According to Tokyo University of Science, Professor Izumi Nakai of the Faculty of Science, Tokyo University of Science, et al. Analysis was performed using the large-scale radiation facility "SPring-3,024" of the High-Brightness Photon Science Research Center in Sayo-cho, and the distribution of heavy minerals and elements was shown on a map of Japan.By analyzing these two types of data in a complex manner, it is possible to estimate which area the unknown sediment belongs to, and it can be used for forensic science.Professor Nakai and his colleagues will continue their research, measure unknown sediments, and strive to enhance the contents of the database.

　The earth and sand left at the crime scene is an important clue to estimate the location related to the incident, but only people with many years of experience and skills can analyze the minerals contained in the earth and sand, and a comprehensive database. Because there was no such thing, it could not be fully utilized for the investigation.Since this database does not require skillful skills and can present materials based on scientific grounds, it is expected to convince the investigation contents and also to prevent the damage caused by the crime.In addition, it can respond to recent crimes that are becoming more widespread.