Development of Micromarkers with Various Photoluminescence Colors as Tracers for Shadowing Pursuits
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- KURATA Shoji
- Criminal Investigation Laboratory, Metropolitan Police Department
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- HIRANO Haruo
- Criminal Investigation Laboratory, Metropolitan Police Department
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- NAGAI Masatoshi
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
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Micromarkers with five photoluminescence colors were developed as tracers for shadowing pursuits. The markers are colorless powders with particle diameters of several tens to several hundreds of micrometers, prepared using a cryogenic sample crusher. They were visualized using red, green, yellow, magenta or cyan photoluminescence under ultraviolet light at approximately 365 nm. The markers were composed of photoluminescent compounds dispersed in polyvinyl butyral. The photoluminescent compounds in the polyvinyl butyral were stable under ambient conditions for more than one year after application. The compounds with the red, green, yellow, magenta and cyan photoluminescence contained a europium (Eu3+) complex, a terbium (Tb3+) complex, a mixture of Tb3+ and Eu3+ complexes, a mixture of Eu3+ complex and o-coumaric acid, and a mixture of Tb3+ complex and 7-hydroxycoumarin along with a few drops of a sodium bicarbonate aqueous solution, respectively. Neodymium (Nd3+) and ytterbium (Yb3+) complexes with photoluminescence in the near-IR wavelength region can also be added to these visible photoluminescent compounds as secret markers for discrimination. The markers were non-destructively identified using a microscopic FT-IR spectrometer and a microscopic spectrometer equipped with a fluorescence detector.
収録刊行物
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- Analytical Sciences
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Analytical Sciences 24 (2), 193-200, 2008
社団法人 日本分析化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679233703808
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- NII論文ID
- 130004441600
- 10021098269
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- NII書誌ID
- AA10500785
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- ISSN
- 13482246
- 09106340
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- NDL書誌ID
- 9362764
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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