Mechanism for fast neutron damage of Ge(HP) detectors

Darken, L. S.; Trammell, Rex C.; Raudorf, T. W.; Pehl, Richard H.; Elliott, Jack H.

doi:10.1016/0029-554x(80)90008-7

Cited by 41 publications

(6 citation statements)

References 47 publications

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“…It is empirically well known that the performance of neutron-damaged detectors can be improved by flooding the detector with charge (for example by placing strong gamma sources close to the counter) until trapping centers get dynamically "loaded" and have a reduced capacity for signal degradation. Similar studies were undertaken in [10] with bias voltage transient effects on resolution and capacitance. We have tried to quantify these effects for our NPX detectors.…”

Section: Effects Of Source Strengthmentioning

confidence: 84%

“…The bias voltage establishes the electric field that drifts the electrons and holes to their respective electrodes for collection. As described by [10], the hole traps can be considered as potential wells with depths proportional to the cross section of the trap. With a stronger electric field, the charge carriers experience a larger force and are less likely to be trapped as the effective capture cross section is reduced [8].…”

Section: Effects Of Increased Bias Voltage: Np3mentioning

confidence: 99%

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Ameliorating neutron damage in orthogonal-strip planar germanium detectors

Jackson

Hull

Lister

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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The segmentation of the electrodes of germanium detectors facilitates gamma-ray imaging and tracking. Replacing the traditional n-type lithium drifted contact is a key to finer segmentation. Amorphous-germanium is a promising alternative contact technology, and large, highly segmented detectors have been fabricated. One factor in adopting any new detector technology is its robustness in hostile environments. Therefore, to explore the effects of neutron damage on position sensitive amorphous-contact germanium gamma-ray detectors and investigate methods for mitigation and repair of damage, two detectors were intentionally exposed to a non-uniform neutron fluence of greater than 4(1) x 10 9 n/cm 2 produced in the 7 Li(p, n) 7 Be reaction at the UMass Lowell Van-de-Graaff accelerator. Post-irradiation tests were made on the counters by varying the electric field, the charge deposition rate, the operating temperature, and utilizing various annealing cycles in order to ascertain the robustness of their performance after irradiation.

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Section: Effects Of Source Strengthmentioning

confidence: 84%

Section: Effects Of Increased Bias Voltage: Np3mentioning

confidence: 99%

Ameliorating neutron damage in orthogonal-strip planar germanium detectors

Jackson

Hull

Lister

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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“…It is possible, and often necessary in many applications, to extract more than the energy of the interacting γ-ray from the detector signal. Many signal-processing techniques have been developed to extract the time of the interaction, the type of radiation, and rough estimations of the mean position of the interactions [27][28][29][30]. interactions within the volume of the detector to better than that of the segment size.…”

Section: Localization Of γ-Ray Interactionsmentioning

confidence: 99%

Advanced pulse-shape analysis and implementation of gamma-ray tracking in a position-sensitive coaxial HPGe detector

Kuhn

2002

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A new concept in γ-radiation detection utilizing highly segmented positionsensitive germanium detectors is currently being developed. Through pulse-shape analysis these detectors will provide the three-dimensional position and energy of individual γ-ray interactions and allow the full-energy and direction vectors of the incident radiation to be reconstructed in a process termed tracking. Here, a prototype segmented detector has been utilized in the assessment of theoretically modeled pulse shapes to gain insight into the factors that effect their agreement with those experimentally measured. It was found that simple modeling of the charge-collection process would provide fair agreement between calculated and experimental pulse shapes. However, in some cases significant deviations between the two were present. This was a result of insufficient modeling of all the processes involved in pulse-shape formation. Factors contributing to this include the three-dimensional spatial distribution of the charge carriers, the path of the primary electron, and i Contents List of Figures iii List of Tables vii 3 Examination of the Prototype Detector Pulse Shapes and Position Sensitivity Studies 42 3.1 Calculation of Charge Signals …………………………………………… 3.2 Experimental Measurements of Pulse Shapes from Localized Single Events in the Prototype Detector ………………………………….

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“…where n 0 is the total number of holes produced and λ h is the mean free path for holes [7]. Hull has shown that λ h is highly sensitive to the Ge crystal temperature and exhibits a temperature hysteresis [8].…”

Section: Introductionmentioning

confidence: 99%