Improved x-ray spectroscopy with room temperature CZT detectors

Area of Science:

• Materials Science
• Nuclear Instrumentation
• Spectroscopy

Background:

• Room temperature semiconductor detectors are crucial for X-ray imaging and radiation detection.
• Cadmium zinc telluride (CZT) detectors show promise but suffer from low-energy spectral tailing caused by hole trapping.
• Existing spectral post-correction methods are insufficient to address tailing effects.

Purpose of the Study:

• To investigate a combined physical method to eliminate hole trapping and reduce spectral tailing in CZT detectors.
• To evaluate the efficacy of a modified electric field (CAPture technology) coupled with tilted angle irradiation.
• To improve the spectral resolution and accuracy of CZT detectors for X-ray and gamma-ray spectroscopy.

Main Methods:

• Utilized CZT detectors with a cap-shaped electrode (CAPture technology) to modify the electric field.
• Irradiated detectors at both normal (90°) and tilted (30°) angles.
• Performed gamma-ray spectroscopy using 59.6 and 122 keV isotope sources and X-ray spectroscopy at 60, 80, and 120 kVp.
• Corrected spectra for K x-ray escape fractions using Monte Carlo simulations.

Main Results:

• The combination of CAPture technology and 30° tilted angle irradiation nearly eliminated low-energy tailing in both isotope and X-ray spectra.
• Spectral tailing was significantly reduced compared to individual methods or normal irradiation.
• The modified detector configuration demonstrated superior performance in spectral resolution and accuracy.

Conclusions:

• A CZT detector with a modified electric field and tilted angle irradiation effectively resolves the spectral tailing problem.
• This integrated approach offers a promising solution for enhancing CZT detector applications in gamma-ray and X-ray spectroscopy.
• The findings pave the way for more accurate and reliable radiation detection systems.