Direct Conversion X-ray Detector Radiation Shielding
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Solution Overview
Problem
Direct conversion X-ray detectors face challenges with radiation-sensitive signal evaluation electronics being damaged by high-energy X-radiation, and existing solutions for positioning these electronics outside the detector housing are impractical for direct conversion detectors, leading to interference and noise issues.
Innovation Solution
The solution involves arranging signal evaluation electronics close to the X-ray sensor while using an X-ray absorber, such as ZrO2 ceramic, to protect them from radiation, and employing a sensor carrier that adapts thermal expansion to match the substrate, ensuring the electronics are in the radiation shadow and minimizing thermal stress on brittle materials like GaAs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If signal evaluation electronics are arranged close to the X-ray sensor, then noise interference is reduced, but the electronics are exposed to high-energy X-radiation causing damage
Solution Approach 1:
The detector is divided into functionally separate modules: an X-ray sensor module and an electronics module. The electronics are mounted on a separate evaluation board that connects to the sensor via a connector, allowing the sensor to be positioned close to the X-ray source while the electronics are protected at a distance.
Solution Approach 2:
A connector serves as an intermediary element between the X-ray sensor and the evaluation electronics. This connector allows electrical signals to be transmitted while maintaining physical separation, enabling the sensor to remain in the optimal position for signal capture while the electronics are positioned in a protected environment.
2Reliability
If electronics are positioned outside the detector housing, then radiation protection is improved, but coupling of interference and noise voltages increases
Solution Approach 1:
The detector system is segmented into a sensor unit and an evaluation unit. The sensor can be positioned within or close to the detector housing for optimal X-ray detection, while the electronics are segmented onto a separate evaluation board that can be positioned outside the radiation field, reducing noise coupling through proper grounding and shielding design.
Solution Approach 2:
The electrical connection between sensor and electronics is achieved through a three-dimensional connector design that allows signal transmission while maintaining spatial separation. The connector provides multiple contact points for power, signal, and ground connections, enabling the electronics to be positioned in a different spatial dimension away from the X-ray source.
3Adaptability or versatility
If different materials with different thermal coefficients of expansion are used, then functional performance is improved, but thermal stress causes damage to brittle materials
Solution Approach 1:
The evaluation board incorporates local thermal management features including thermally conductive but mechanically compliant mounting structures. The electronics are mounted in regions where thermal expansion is compensated through dedicated compliance elements, allowing different materials to be used in different locations without causing stress to brittle components.
Solution Approach 2:
The design explicitly accounts for thermal expansion differences between materials by incorporating compliance elements and mounting structures that accommodate differential expansion. The evaluation board layout positions sensitive brittle components in regions where thermal stress is minimized, and uses materials with intermediate thermal expansion properties in critical transition zones.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively protects the signal evaluation electronics from X-radiation, reduces noise interference, and allows for improved thermal adaptation of detector components, enhancing the operational stability and efficiency of direct conversion X-ray detectors.
Implementation Method 1
an X-ray absorber, such as ZrO2 ceramic, to protect them from radiation
Implementation Method 2
employing a sensor carrier that adapts thermal expansion to match the substrate
Implementation Method 3
at least one X-ray sensor converting X-radiation directly into electrical charge carriers
Data Source
AI summary
The present invention relates to an X-ray detector having an X-ray sensor (first X-ray sensor) converting X-radiation directly into electric charge carriers, having signal evaluation electronics electrically connected to the X-ray sensor and preferably formed as integrated circuit(s), having an X-ray absorber formed for protecting the signal evaluation electronics, and having a sensor carrier (first sensor carrier) formed and arranged for positioning the X-ray sensor relative to the X-ray absorber, wherein, viewed in the direction of incidence of the X-radiation, both the signal evaluation electronics are arranged behind the X-ray absorber and in the X-radiation shadow thereof and the X-ray sensor is admittedly likewise positioned by means of the sensor carrier preferably arranged between the X-ray absorber and the signal evaluation electronics at least sectionally behind the X-ray absorber, but outside the X-radiation shadow thereof.