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Chemical Imaging Offers Potential New Crime Busting Tool
London UK (SPX) Aug 09, 2007 A new fingerprinting technique could potentially detect the diet, race and sex of a suspected criminal, according to new research published in the August edition of the journal Analytical Chemistry. The team, led by Professor Sergei Kazarian from Imperial College London's Department of Chemical Engineering, has devised a technique which collects fingerprints along with their chemical residue and keeps them intact for future reference. Chemical residues contain a few millionths of a gram of fluid and can be found on all fingerprints. Conventional fingerprinting techniques often distort or destroy vital chemical information with no easy way of lifting residues for chemical imaging, until now. Imperial scientists found that the use of gel tapes, commercial gelatine based tape, provides a simple method for collection and transportation of prints for chemical imaging analysis. The prints, once lifted, are analysed in a spectroscopic microscope. The sample is irradiated with infrared rays to identify individual molecules within the print to give a detailed chemical composition. The information is then processed by an infrared array detector, originally developed by the U.S. military in smart missile technology. The array detector chemically maps the residue. This process builds up a picture, or chemical photograph, and allows for the most comprehensive information obtained from a fingerprint. "The combined operational advantages and benefits for forensic scientists of tape lifting prints and spectroscopic imaging really maximises the amount of information one can obtain from fingerprints. Our trials show that this technique could play a significant role in the fight against crime," said Professor Kazarian. In many cases, this information is enough to determine valuable clues about a person beyond the fingerprint itself. It could potentially identify traces of items people came in contact with, such as gunpowder, narcotics and biological or chemical weapons. Chemical clues could also highlight specific traits in a person. A strong trace of urea, a chemical found in urine, could indicate a male. Weak traces of urea in a chemical sample could indicate a female. Specific amino acids could potentially indicate whether the suspect was a vegetarian or meat-eater. Professor Kazarian believes that this technique could allow forensic scientists to observe how fingerprints change in time and within different environments. "By focussing on what is left in a fingerprint after periods of time, scientists could potentially gauge how old a crime scene is. Studying what happens to prints, when they are exposed to high temperatures, could also be particularly significant, especially in arson cases where lifting prints has been notoriously hard," he said. Speculating about the possible future benefits of this process, Professor Sergei Kazarian said: "In the courtroom of the near future, chemical images could feature as key evidence. I hope our work assists law enforcement authorities to bring dangerous criminals to justice." Related Links Imperial College London Analytical Chemistry The latest in Military Technology for the 21st century at SpaceWar.com
Tourism The Casualty For Radiation Leak City
Kashiwazaki, Japan (AFP) Aug 07, 2007Staring at the few carefree teenagers frolicking about in the water, beach worker Hitoshi Arakawa was full of resentment over a leak at a nearby nuclear plant. "They say the exposure level won't harm people's health, but the very fact that there was radiation leakage kills businesses like ours," Arakawa said furiously, with unsold stocks of corn piled up under his table. Arakawa, 42, is one of the seasonal workers who set up food and drink booths during the summer on Kujiranami beach, only 10 kilometres (six miles) down the seashore from the world's largest nuclear power plant. |
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