Activation analysis

a method for the qualitative and quantitative determination of trace amounts of various elements by measuring the characteristic radioactive decay induced by neutron bombardment.

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  • Activation

    to make active; cause to function or act. Physics. to render more reactive; excite: to activate a molecule. to induce radioactivity. to aerate (sewage) in order to accelerate decomposition of impure organic matter by microorganisms. Chemistry. to make (carbon, a catalyst, molecules, etc.) more . to hasten (reactions) by various means, as heating. to place […]

  • Activation energy

    the least amount of energy required to activate atoms or molecules to a state in which they can undergo a chemical reaction. activation energy (āk’tə-vā’shən) The least amount of energy needed for a chemical reaction to take place. Some elements and compounds react together naturally just by being close to each other, and their activation […]

  • Activation record

    activation record compiler (Or “data frame”, “stack frame”) A data structure containing the variables belonging to one particular scope (e.g. a procedure body), as well as links to other activation records. Activation records are usually created (on the stack) on entry to a block and destroyed on exit. If a procedure or function may be […]

  • Activator

    a person or thing that . Chemistry, Biochemistry. a catalyst. any impurity in a mineral that causes luminescence. Compare (def 3). Orthodontics. a removable appliance, usually of hard plastic, that is worn in the mouth instead of a fixed appliance to help align the teeth and improve the relationship of the lower jaw to the […]

  • Active

    engaged in ; characterized by energetic work, participation, etc.; busy: an active life. being in a state of existence, progress, or motion: active hostilities. involving physical effort and : active sports. having the power of quick motion; nimble: active as a gazelle. characterized by , motion, volume, use, participation, etc.: an active market in wheat; […]

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