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Temporal instabilities associated with a planar high purity germanium detector.

N D Pugh¹, G M Owen, W D Evans

¹Department of Medical Physics and Bioengineering, University Hospital of Wales, Cardiff, UK.

Physics in Medicine and Biology

|May 1, 1990

Summary

Grooved germanium detectors show time-varying counts due to charge collection issues. This impacts x-ray fluorescence sensitivity, but collimation can mitigate the problem.

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Area of Science:

Semiconductor detector physics
Materials science

Background:

High purity germanium (HPGe) detectors are crucial for precise elemental analysis.
Grooved detector geometries are employed to enhance performance but can introduce complexities.

Purpose of the Study:

Investigate the origin of time-variant counting rates observed in grooved planar HPGe detectors.
Analyze the impact of these count rate variations on x-ray fluorescence (XRF) measurements.

Main Methods:

Experimental measurements of counting rates in grooved HPGe detectors below spectral peaks.
Postulation of charge collection anomalies and electric field distortions as the cause.

Main Results:

Observed time-variant counting rates in specific energy regions of grooved HPGe detectors.

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Attributed these variations to prolonged or incomplete charge collection near groove bottoms.

Identified electric field distortions in the groove vicinity as the underlying mechanism.

Conclusions:

Grooved planar HPGe detectors exhibit count rate instability below spectral peaks due to charge collection issues.
This instability affects the minimum detectable count rate in XRF.
Collimating incident photons to the detector's central region can reduce these effects but decreases overall sensitivity.