LIKE high-tech colleagues of Sherlock Holmes, experts from Lawrence Livermore's Forensic Science Center develop sophisticated analytical equipment for combatting terrorism and the proliferation of weapons of mass destruction, supporting stockpile stewardship efforts, and responding to law-enforcement requests. Using center-developed prototypes, these experts in organic, inorganic, biological, and nuclear chemistry can determine the composition and often the source of the most minute samples of evidence. The sophistication of their sleuthing is beyond the wildest dreams of even Mr. Holmes and Dr. Watson.![]() ![]() |
Recipe for Safety: Yellow Cake and Simple Green
In the summer of 1998, Secretary of Energy Bill Richardson announced a new partnership between the Federal Bureau of Investigation (FBI) and Lawrence Livermore to combat international terrorism with high technology. This formal partnership affirms the role the Forensic Science Center plays in supporting forensic investigations.
Two recent incidents--both with happy endings--demonstrate the speed and efficiency with which the center responds to urgent requests from law-enforcement agencies and nuclear regulators.
The first incident involved unknown material in a coffee can obtained by a high school student at a local swap meet. The material--a light yellow, very fine powder--was confiscated by the school. The material was discovered to be radioactive, and the center was called in by DOE.
Nuclear chemist Ken Moody performed the analysis and relayed the results back to DOE within 16 hours of receiving the material. "Since everyone was anxious to get immediate results, we expedited nuclear counting techniques and assayed the material with gamma-ray spectrometry and alpha-particle spectroscopy. We measured no radionuclides above background other than unperturbed isotopes of uranium. The material was naturally occurring uranium, or yellow cake, not an enriched or otherwise processed uranium compound."
The second incident occurred as FBI agents searched the Los Angeles home of a man arrested for stealing military weapons. Among an arsenal of assault rifles, hand guns, explosives, and heavy-duty flak vests, they found a jar of green liquid labeled "poison." Concerned that the liquid might be a chemical warfare agent, the FBI contacted the center.
"Rich Whipple and I conducted field sampling within an FBI-controlled area," explained Pat Grant, deputy director of the center. "We put the sample--which had been well packaged by a hazardous materials team--into a containment glovebag inside a field-portable hood. Using the solid-phase microextraction (SPME) technique, we exposed two microfibers, one at a time, to the liquid and then repackaged the jar. We transported the SPME fibers to the center in O-ring-sealed metal containers. Armando Alcaraz performed gas chromatography-mass spectrometry (GC-MS) analyses, we analyzed and interpreted the data, and the results were reported to the FBI just two-and-a-half hours after the start of our investigation."
Good news. The green substance turned out to be a nontoxic cleaning solution. In fact, the next day Whipple brought in a commercial "simple green" household cleanser and ran a SPME GC-MS analysis of the fluid. The chemical signatures of the commercial product and the suspect solution were virtually identical.
Blast from the Past![]() ![]() ![]() ![]() ![]() ![]() |
Back to the Future for the Stockpile![]() ![]() ![]() ![]() ![]() |
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The Future of Forensic Analysis |
Key Words: Federal Bureau of Investigation (FBI), Forensic Science Center, gas chromatograph-mass spectrometer (GC-MS), solid-phase microextraction (SPME), thin-layer chromatography (TLC).
For further information contact Brian Andresen (925) 422-0903 (andresen1@llnl.gov).