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Related Concept Videos

Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Atomic Emission Spectroscopy: Overview01:20

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Noble Gases02:54

Noble Gases

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The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Related Experiment Video

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High Precision Zinc Isotopic Measurements Applied to Mouse Organs
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Radioxenon standards used in laboratory inter-comparisons.

H Gohla1, M Auer1, Ph Cassette2

  • 1CTBTO Preparatory Commission, Austria.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|December 20, 2015
PubMed
Summary
This summary is machine-generated.

New Xenon-133 standards were created for the International Monitoring System

Keywords:
(127)Xe(131m)Xe(133)Xe(133m)Xe(135)XeComprehensive Nuclear–Test–Ban Treaty (CTBT)Environmental monitoringInternational Monitoring System (IMS)Noble gasQA/QC programRadioxenon standards

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Area of Science:

  • Nuclear chemistry
  • Environmental monitoring
  • Radiochemistry

Background:

  • The International Monitoring System (IMS) requires robust quality assurance/quality control (QA/QC) for its laboratories.
  • Historically, a lack of activity concentration standards for Xenon-133 (Xe-133) hindered effective benchmarking.
  • Independent laboratories have now produced Xe-133 reference standards.

Purpose of the Study:

  • To describe the preparation methods for Xe-133 activity concentration standards.
  • To report the outcomes of the 2014 Xe-133 laboratory inter-comparison exercise.
  • To evaluate Xenon-127 (Xe-127) as a potential isotope for future QA/QC.

Main Methods:

  • Development of preparation methods for Xe-133 activity concentration reference standards.
  • Conducting a laboratory inter-comparison exercise using these standards in 2014.
  • Preparation of a Xe-127 activity concentration standard and a Xe-127 inter-comparison exercise.

Main Results:

  • Successful production of two independent Xe-133 activity concentration reference standards.
  • Completion of the 2014 Xe-133 laboratory inter-comparison exercise.
  • Demonstration of Xe-127's suitability for QA/QC of remote IMS noble gas stations.

Conclusions:

  • The availability of Xe-133 standards enables crucial QA/QC for the IMS.
  • Xe-127 is a promising alternative isotope for QA/QC of remote noble gas monitoring.
  • These advancements support the reliability of the International Monitoring System.