Los Alamos National Laboratory scientists are using a new technique to e fingerprints on surfaces that typically make them invisible. The method us a technology called mini-X-ray fluorescence to detect chemical elements in fingerprints without altering them， said Christopher Worley， a scientist on the project.
“The conventional methods are meant to bring out fingerprint patterns with regular light and they have to treat tho with powder， which alters them，” Worley said. “With this you don't have to alter it or treat it at all. We can determine the elements in a fingerprint and get a pattern at the same time.”
地球什么时候毁灭 The technology focus a tight beam of X-rays on surfaces with fingerprints and creates a computer picture out of tho scans. The equipment costs about $175，000. For big labs， the method could be a great way to bring out prints that can't be en any other way， said Vahid Majidi， another lab scientist.
忘不了前任怎么办 “The technique fills a unique niche，” Majidi said. “The are prints that would otherwi be uless. If you have prints on a dark surface， for example， they really don't develop well using normal techniques. If you have prints from an adolescent or child， the chemicals in the fingertips are different and don't stick around long enough for traditional methods.” The new method might also be able to tell
if the person that left them handled certain types of bomb-making materials，said George Havrilla， another lab scientist. “This is a new approach to fingerprint visualization，” Havrilla said. “We're lifting prints， but instead of looking at the finger's natural oils and organic residues we're looking at elemental features left behind.” The technology for scanning the prints is widely available. What’s new is the method the lab has created to e them which includes computer software and ways of manipulating the machinery， Worley said.
第三方存管金光闪闪亮>白萝卜烧牛肉>超市英语单词 辅助翻译：美国洛斯阿拉莫斯国家实验室的科学家们采⽤了⼀种新技术，可以观察到原本很难在物体表⾯上看见的指纹。参与该科研项⽬的科学家克⾥斯托弗。沃尔利说，该⽅法使⽤了⼀种“微X射线束荧光技术”，可以探测到指纹携带的化学成分，却不会改变指纹的保存状态。喷管
>治疗焦虑症最好的方法
