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Method for determining a bias affecting pixels of a pixellated ionising radiation detector

An ionizing radiation, detector technology, used in radiation measurement, radiation intensity measurement, X/γ/cosmic radiation measurement, etc.

Pending Publication Date: 2021-06-25
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this assumes specific calibration operations outside of normal use of the device

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  • Method for determining a bias affecting pixels of a pixellated ionising radiation detector
  • Method for determining a bias affecting pixels of a pixellated ionising radiation detector
  • Method for determining a bias affecting pixels of a pixellated ionising radiation detector

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Embodiment Construction

[0049] Figure 1A and Figure 1BShown is a pixelated radiation detector 1 configured to interact with ionizing radiation 5. Ionizing radiation is radiation formed by particles capable of ionizing matter. It may involve alpha radiation, beta radiation, photon X-ray or gamma radiation or even neutron radiation. In the example shown, the radiation is photonic gamma radiation, which is formed by photons, which photons comprise, for example, an energy of 1 keV to 2 MeV. The invention is particularly useful for exposing radiation detectors to isotopic gamma emitting sources.

[0050] In the example shown, the detector comprises a semiconductor detector 2 of the CdTe type, but it may also relate to any semiconductor commonly used for detecting ionizing radiation (e.g. Ge, Si or CdZnTe). The semiconductor is biased by an electric field E formed between the anode 10 and the cathode 20, when particles of ionizing radiation 5 (photons in this case) interact in the detector 1, charge c...

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Abstract

A method for determining a bias (betai,j) affecting at least one pixel of a detector (1) of ionizing radiation, the detector comprising a plurality of pixels (10i,j), each pixel being configured to collect charge carriers (6) generated by an interaction of the ionizing radiation in the detector, and to form a pulsed signal under the effect of the generation and collection of the charge carriers, the pixels being distributed in a matrix array, the method comprising:a) following the occurrence of an interaction in the detector, determining a pixel forming a pulse that exceeds an amplitude threshold, during a detection time interval; b) among each pixel determined in step a), selecting a pixel of interest that generates a highest amplitude; c) selecting at least one distant pixel (10f), the position of the distant pixel, with respect to the pixel of interest, being defined beforehand; d) measuring an amplitude of a signal generated by each distant pixel; e) on the basis of each measurement performed in step d), determining a bias at the detection time for each distant pixel.

Description

technical field [0001] The invention relates to detectors of ionizing radiation, especially photon X-rays or gamma radiation. Background technique [0002] Devices for detecting ionizing radiation based on gas, semiconductor or scintillation detector materials allow to obtain electrical pulses formed by the interaction of radiation in the detector material. The amplitude of each pulse depends on the energy deposited by the radiation during each interaction. These devices are often used in applications that require knowledge of the energy of ionizing radiation incident on the detector. The fields of application are wide-ranging and include, inter alia, non-destructive testing (e.g. baggage screening), medical diagnostics or measurements in nuclear facilities. Typically, the devices used are pixelated in order to generate spatially resolved information. The detection means may be linear when the pixels are aligned to form straight lines. The detection means may also be two...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/20G01T1/16
CPCG01T1/20G01T1/16G01T1/247G01T1/241
Inventor 西尔万·斯坦基纳
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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