Embark on a journey of knowledge! Take the quiz and earn valuable credits.
Take A QuizChallenge yourself and boost your learning! Start the quiz now to earn credits.
Take A QuizUnlock your potential! Begin the quiz, answer questions, and accumulate credits along the way.
Take A QuizPlease log in to access this content. You will be redirected to the login page shortly.
LoginGeneral Miscellaneous in General 11 months ago
The Trace Metal Detection Test (TMDT) or Technique was developed during the Vietnam War in the 1960s to identify people who may have been carrying firearms against their skin. A 0.2% solution of 8-hydroxyquinoline in isopropanol sprayed on the skin and illuminated with shortwave ultraviolet (UV) light after several minutes reveals a pattern and type of metal based on trace amounts of metal transferred to the skin that are invisible under normal lighting. The technique was later adopted by police in the United States to help determine if a person had carried a firearm. In a California crime an automatic handgun carried in the waistband of a criminal reportedly produced an impression of the weapon's serial number. Presence and persistence of a detectable residue depends primarily on the amount of perspiration, length of contact, and time since exposure. A few minutes of exposure can leave detectable residue and the result can remain for up to forty-eight hours.
Preservation of the results is done with black-and-white and color photography. Use of a shortwave ultraviolet filter over the camera flash can be used to record the results, although a steady source of UV is preferred. In either case a darkened area is needed for screening purposes. Another reagent, 0.5 percent 2-nitroso-1-naphthol in acetone, eliminated the need for a UV light but is limited to a four-hour-window versus the forty-eight for 8-hydroxyquinoline.
reference nanPosted on 22 Nov 2024, this text provides information on General related to Miscellaneous in General. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
Turn Your Knowledge into Earnings.
No matter what stage you're at in your education or career, TuteeHub will help you reach the next level that you're aiming for. Simply,Choose a subject/topic and get started in self-paced practice sessions to improve your knowledge and scores.
Ready to take your education and career to the next level? Register today and join our growing community of learners and professionals.
Your experience on this site will be improved by allowing cookies. Read Cookie Policy
Your experience on this site will be improved by allowing cookies. Read Cookie Policy