Investigations on performance and spectroscopic capabilities of a 3 mm CdTe Timepix detector

Fey, Julian; Procz, S.; Schütz, Michael; Fiederle, M.

doi:10.1016/j.nima.2020.164308

Cited by 10 publications

(13 citation statements)

References 22 publications

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“…The measured raw ToT values for a given incident energy will be dispersed. This dispersion is induced on the one hand by the manufacturing process of the ASIC (Application Specified Integrated Circuit), which generates differences in the performances of transistors, and on the other hand, by the crystal defects of the CdTe sensor, such as dislocations and point defects, causing an inhomogeneous sensor layer [12], [13]. As an example, Fig.…”

Section: B Per Pixel Energy Calibration 1) Interests and Motivationmentioning

confidence: 99%

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Evaluation of Timepix3 Si and CdTe Hybrid-Pixel Detectors’ Spectrometric Performances on X- and Gamma-Rays

Amoyal

Ménesguen

Schoepff

et al. 2021

IEEE Trans. Nucl. Sci.

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Section: B Per Pixel Energy Calibration 1) Interests and Motivationmentioning

confidence: 99%

“…In the case of Timepix3 CdTe, the energy calibration was evaluated by irradiating Timepix3 CdTe from the back of the detector, as suggested in [13]. This implies that before interacting in the semiconductor, incoming photons must pass through the PCB, but most importantly through the ASIC.…”

Section: A Per Pixel Energy Calibration Of Timepix3 Cdtementioning

confidence: 99%

Evaluation of Timepix3 Si and CdTe Hybrid-Pixel Detectors’ Spectrometric Performances on X- and Gamma-Rays

Amoyal

Ménesguen

Schoepff

et al. 2021

IEEE Trans. Nucl. Sci.

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“…Cluster analysis was performed as detailed in [27], with the addition of the time-sensitive component of the Timepix3. The clustering algorithm works by associating active pixels, located inside a predefined radius and time window.…”

Section: Clustering Algorithmmentioning

confidence: 99%

Sub-pixel energy-weighting techniques for metallic contaminant highlighting in a pharmaceutical hard capsule using a Timepix3 CdZnTe hybrid pixel detector

Roque¹,

Schütz²,

Fey³

et al. 2022

J. Inst.

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The presented work describes the capabilities of a state-of-the-art spectroscopic photon-counting hybrid pixel detector for use in non-destructive testing, as a contaminant detector with potential uses in the food and pharmaceutical industries. A pharmaceutical hard capsule containing vitamin powder, contaminated with Steel (ST) and Tungsten (W) was prepared under controlled conditions. Both contaminants are distinguished from the powder by combining sub-pixel imaging with spectroscopic imaging analysis, made possible by the use of a 2 mm CdZnTe sensor coupled to a Timepix3 ASIC, operated in Time-over-Threshold and Time-of-Arrival mode. The sub-pixelization technique achieves a spatial resolution of 18.3 μm, with a maximum photon flux of 2.5× 106 photons/s· cm2. For the spectral analysis technique implemented, each energy bin image is energy-weighted, with weights optimally defined by considering the bin contrast and noise behavior, and combined to form an integrated-spectrum enhanced image with increased contaminant visibility. Contrast-to-Noise Ratio (CNR) for each contaminant type was used for performance assessment of the approach. A CNR increase of 106% above the reference unweighted-spectrum image was achieved for the ST contaminant, while the denser W contaminant showed a CNR increase of 80%. This means that the presented spectroscopic imaging technique is feasible for implementation in material visibility enhancement.

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“…The high atomic number (Z CdTe ≈ 50) and density (ρ = 5.854 g/cm 3 at RT) provide superior attenuation efficiency above 30 keV compared to Si (Z Si = 14) and GaAs (Z GaAs ≈ 32) and the wide bandgap energy (E gap = 1.44 eV) permits the usage of the detector at room temperature without active cooling. The absorption efficiency can be enhanced furthermore by increasing the thickness of the material [5].…”

Section: Cadmium Telluridementioning

confidence: 99%

CdTe sensor configurations for robot assisted photon counting gamma camera

et al. 2021

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In this work, different Cadmium Telluride (CdTe) sensor configurations are assessed for the usage in a robot assisted portable gamma camera. In the first part, four CdTe sensors, with thickness of 0.45 mm, 1 mm, 2 mm and 3 mm and pixel sizes of 55 µm and 110 µm, are investigated regarding their spectroscopic performance. The photon counting detector Timepix1 is hereby used. The 3 mm CdTe sensor shows increase in count rate up to a factor of 1.25 compared to a 2 mm CdTe sensor, 1.84 compared to a 1 mm CdTe sensor and up to 2.71 compared to a 0.45 mm CdTe sensor in the case of 137 Cs. In the second part, the 3 mm CdTe sensor was implemented in a commercially available gamma camera, the iPIX. The system was integrated in the bomb disposal robot and tested in different scenarios. The integrated 3 mm CdTe detector measured 21.5 counts per second emitting from a 60 Co source with an activity of 2.8 ± 0.07 Gbq in 20 meters distance in an open environment. The acquisition time was 116 seconds. The angular resolution was sufficient for the user to localize the radioactive isotope inside the test structure.

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Investigations on performance and spectroscopic capabilities of a 3 mm CdTe Timepix detector

Cited by 10 publications

References 22 publications

Evaluation of Timepix3 Si and CdTe Hybrid-Pixel Detectors’ Spectrometric Performances on X- and Gamma-Rays

Evaluation of Timepix3 Si and CdTe Hybrid-Pixel Detectors’ Spectrometric Performances on X- and Gamma-Rays

Sub-pixel energy-weighting techniques for metallic contaminant highlighting in a pharmaceutical hard capsule using a Timepix3 CdZnTe hybrid pixel detector

CdTe sensor configurations for robot assisted photon counting gamma camera

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