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Related Concept Videos

Flame Photometry: Overview01:02

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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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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Fast Pyrolysis of Biomass Residues in a Twin-screw Mixing Reactor
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Performance evaluation of PRIDE UNDA system with pyroprocessing feed material.

Su Jung An1, Hee Seo1, Chaehun Lee1

  • 1Nonproliferation System Research Division, KAERI, Daedeok-daero 989 Beon-gil, Yuseong-gu, Daejeon 34057, South Korea.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|January 15, 2017
PubMed
Summary
This summary is machine-generated.

The Unified Non-Destructive Assay (UNDA) system effectively measures uranium (U) weight, mass, and enrichment in pyroprocessing feed materials. This enhances nuclear material accountancy (NMA) for improved safeguardability in facilities like PRIDE.

Keywords:
Nondestructive assayNuclear safeguardsNuclear-material accountancyPyroprocessing

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Area of Science:

  • Nuclear Engineering
  • Materials Science
  • Analytical Chemistry

Background:

  • The PRIDE facility uses depleted uranium for pyroprocessing research.
  • Enhancing safeguardability is crucial for nuclear material accountancy (NMA).
  • The Unified Non-Destructive Assay (UNDA) system was developed to integrate neutron, gamma-ray, and mass measurement techniques.

Purpose of the Study:

  • To evaluate the NMA capability of the UNDA system.
  • To assess UNDA's performance in measuring uranium weight, 238U mass, and U enrichment.
  • To validate UNDA for use in the PRIDE facility.

Main Methods:

  • Utilized depleted uranium oxide-reduction-process feed material (porous pellets).
  • Measured total neutron counts for 238U mass determination across varying pellet weights.
  • Determined uranium enrichment using gamma spectrums from UNDA's NaI-based system.

Main Results:

  • The UNDA system demonstrated reasonable uncertainty for NMA applications in PRIDE after corrections.
  • Accurate measurements of porous pellet weight, 238U mass, and U enrichment were achieved.
  • The study validates UNDA's potential for safeguarding pyroprocessing operations.

Conclusions:

  • The UNDA system is suitable for nuclear material accountancy in the PRIDE facility.
  • Future testing will involve more advanced materials from pyroprocessing.
  • UNDA contributes to enhanced safeguardability in nuclear material management.