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Updated: May 22, 2026

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Gepta-EX: a multi-channel germanium detector for X-ray absorption fine structure.

Abdul K Rumaiz¹, Francesca Capocasa², Anthony J Kuczewski¹

¹NSLS II, Brookhaven National Laboratory, Upton, NY 11973, USA.

Journal of Synchrotron Radiation

|May 21, 2026

Summary

This summary is machine-generated.

We developed Gepta-EX, a novel germanium detector system for high-energy X-ray spectroscopy. This system offers superior energy resolution and efficiency for fluorescence-mode X-ray absorption spectroscopy (XAS) applications.

Keywords:

EXAFS X-ray absorption detector germanium spectroscopy

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Published on: August 25, 2016

Area of Science:

Materials Science
Spectroscopy
Detector Physics

Background:

High-energy fluorescence-mode X-ray absorption spectroscopy (XAS) demands detectors with high stopping power and energy resolution.
Silicon detectors lack efficiency above 20 keV, while other high-Z materials are optimized for imaging, not spectroscopy.

Purpose of the Study:

To develop and evaluate a compact, multi-channel high-purity germanium (HPGe) detector system for high-energy XAS.
To overcome the limitations of existing detectors for weak signal detection in XAS.

Main Methods:

Fabrication of a monolithic seven-channel HPGe pixel array.
Integration with low-noise CUBE charge-sensitive preamplifiers.
Operation within a compact, thermally isolated cryostat near 90 K.

Main Results:

The Gepta-EX system demonstrated excellent energy resolutions: 218 eV at 5.9 keV and 373 eV at 59.5 keV.
Uniform performance was achieved across all seven channels.
The detector avoids escape peak interference common in silicon detectors.

Conclusions:

Gepta-EX provides stable, high-resolution performance for high-energy X-ray spectroscopy.
This HPGe detector system is a powerful new tool for fluorescence-mode XAS.
It enables more precise measurements of element-specific signals in challenging energy ranges.