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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Atomic Absorption Spectroscopy: Instrumentation01:22

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Gas Chromatography: Types of Detectors-II01:19

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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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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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NMR Spectrometers: Overview01:20

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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TWO NEW SINGLE-EXPOSURE, MULTI-DETECTOR NEUTRON SPECTROMETERS FOR RADIATION PROTECTION APPLICATIONS IN WORKPLACE

J M Gómez-Ros1,2, R Bedogni2, D Bortot3

  • 1CIEMAT, Av. Complutense 40, 28040 Madrid, Spain.

Radiation Protection Dosimetry
|January 20, 2017
PubMed
Summary
This summary is machine-generated.

Two new instruments accurately characterize neutron fields and monitor workplaces using advanced thermal neutron detectors. These devices provide detailed neutron spectra and integral quantities, crucial for safety in neutron-producing facilities.

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Area of Science:

  • Nuclear physics and instrumentation
  • Radiation detection and measurement
  • Neutron dosimetry and spectrometry

Background:

  • Accurate characterization of neutron fields is essential for radiation safety.
  • Existing methods for neutron spectrum unfolding and integral quantity determination can be time-consuming.
  • Workplace monitoring in neutron-producing facilities requires efficient and reliable instrumentation.

Purpose of the Study:

  • To introduce two novel instruments for comprehensive neutron field characterization.
  • To enable simultaneous unfolding of neutron spectra and determination of integral quantities with a single exposure.
  • To provide improved tools for workplace monitoring in neutron-producing environments.

Main Methods:

  • Development of two instruments featuring multiple active thermal neutron detectors within a single moderator.
  • Design of spherical (isotropic response) and cylindrical (axis-sensitive) devices.
  • Specific development of miniaturized, high-sensitivity active detectors with good photon rejection.
  • Validation of calculated response matrices using experimental irradiations in reference neutron fields.
  • Measurement and analysis of neutron spectra and integral quantities, including H*(10), in realistic fields.

Main Results:

  • The instruments successfully unfold neutron spectra from thermal to hundreds of MeV.
  • Integral quantities, including dose equivalent H*(10), are determined with high accuracy.
  • Validation by experimental irradiations confirmed a global uncertainty of 3%.
  • The devices demonstrated advantageous performance for neutron field characterization and workplace monitoring.

Conclusions:

  • The developed instruments offer a significant advancement in neutron field characterization and monitoring.
  • Their ability to provide comprehensive spectral and integral data in a single exposure enhances efficiency and safety.
  • These instruments are particularly valuable for applications in neutron-producing facilities.