Semiconductor Detector Radiation Shield for Noise Reduction
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Solution Overview
Problem
Semiconductor radiation detectors suffer from radiation-induced ageing, leading to increased surface-generated current and 1/f noise, which reduces measurement accuracy and necessitates frequent replacements.
Innovation Solution
A radiation shield is implemented to protect the anode region and adjacent amplifier from incoming radiation, using a layer of heavy material that selectively overlaps the collection electrode and amplifier to prevent dielectric loss and noise increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detector absorbs radiation to perform detection, then detection capability is improved, but radiation-induced ageing increases surface-generated current and 1/f noise
Solution Approach 1:
The detector is segmented into a radiation-sensitive detection region and a radiation-shielded anode region. The shielding layer divides the detector structure so that only the necessary detection area is exposed to radiation, while the anode and amplifier regions are protected. This segmentation allows the detector to maintain detection capability in the exposed region while preventing radiation-induced ageing in the shielded region.
Solution Approach 2:
Different regions of the detector are given different radiation exposure characteristics. The detection region maintains high radiation sensitivity with full exposure, while the anode and amplifier regions have reduced radiation exposure through selective shielding. This local differentiation of radiation quality optimizes both detection performance and long-term reliability.
2Productivity
If the detector operates for extended periods, then more radiation measurements can be performed, but 1/f noise increases due to radiation-induced ageing
Solution Approach 1:
The shielding structure is pre-configured to protect the anode and amplifier regions from radiation exposure before ageing effects can develop. This preliminary protective action prevents the accumulation of radiation-induced defects that would otherwise increase 1/f noise over time, thereby maintaining measurement precision throughout the detector's operational life.
Solution Approach 2:
The shielding layer acts as a protective cushion against radiation damage to the anode and amplifier regions. By providing this beforehand cushioning, the detector can operate for extended periods without the progressive degradation of signal-to-noise ratio that would otherwise occur due to radiation-induced ageing.
3Reliability
If the anode region is exposed to radiation, then charge collection is efficient, but dielectric loss increases due to radiation-induced defects
Solution Approach 1:
The harmful radiation exposure is extracted or removed from the anode region through selective shielding, while the detection region continues to operate with full radiation exposure. This extraction of radiation from the anode area prevents dielectric loss accumulation without compromising the charge collection efficiency in the detection region.
Solution Approach 2:
The shielding layer serves as an intermediary element that selectively blocks radiation from reaching the anode and amplifier regions while allowing radiation to reach the detection region. This intermediary structure enables the system to maintain efficient charge collection where needed while preventing dielectric loss where it would be harmful.
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
The radiation shield significantly reduces radiation-induced damage, maintaining measurement accuracy and extending the detector's operational lifespan by preventing dielectric loss and 1/f noise in the anode and amplifier regions.
Implementation Method 1
A radiation shield is implemented to protect the anode region and adjacent amplifier from incoming radiation, using a layer of heavy material
Implementation Method 2
a drift detector is a semiconductor radiation detector in which a transversal electric field created inside a block of semiconductor material drives radiation-induced signal charges to a collection electrode
Data Source
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AI summary
A semiconductor radiation detector comprises a bulk layer of semiconductor material. On a first side of said bulk layer is an arrangement of field electrodes and a collection electrode (103) for collecting radiation-induced signal charges from said bulk layer. A radiation shield (402) exists on a second side of said bulk layer, opposite to said first side, which radiation shield selectively overlaps the location of said collection electrode.