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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).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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Silicon Detector System for High Rate EXAFS Applications.

A Pullia1, H W Kraner1, D P Siddons1

  • 1Brookhaven National Laboratory, Upton, NY 11973-5000, USA.

IEEE Transactions on Nuclear Science
|November 6, 2015
PubMed
Summary
This summary is machine-generated.

A new multichannel silicon pad detector achieves excellent energy resolution for Extended X-ray Absorption Fine Structure (EXAFS) applications. Cooling with Peltier cells significantly improves performance, making it suitable for EXAFS spectroscopy.

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Area of Science:

  • Instrumentation
  • Materials Science
  • Spectroscopy

Background:

  • Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy requires detectors with high energy resolution.
  • Silicon pad detectors are commonly used but performance can be limited by thermal noise.
  • Achieving adequate resolution at room temperature for EXAFS is challenging.

Purpose of the Study:

  • To design and construct a multichannel silicon pad detector for EXAFS.
  • To evaluate the detector's energy resolution under varying temperature conditions.
  • To assess the effectiveness of a simple cooling system for performance enhancement.

Main Methods:

  • Fabrication of a multichannel silicon pad detector.
  • X-ray spectroscopic measurements to determine energy resolution.
  • Utilized a cooling system with Peltier cells to reduce detector temperature.
  • Evaluated detector performance at -35 °C and room temperature (25 °C).

Main Results:

  • Achieved an average energy resolution of 230 eV FWHM at -35 °C.
  • Individual pads demonstrated a resolution of 190 eV FWHM at -35 °C.
  • At room temperature, average resolution was 380 eV FWHM, with best performance at 350 eV FWHM.
  • Cooling reduced reverse currents and shot noise, enabling resolutions better than 300 eV FWHM.

Conclusions:

  • The designed silicon pad detector meets the resolution requirements for EXAFS applications.
  • A simple Peltier cell cooling system is effective in significantly improving detector performance.
  • The detector offers a viable solution for EXAFS spectroscopy, particularly when cooled.