Dual-Chamber Radiation Detector with Ionization Correction
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Solution Overview
Problem
Existing radiation detectors face challenges in achieving high precision for two-dimensional imaging and dosimetric accuracy due to non-linearities and sensitivity variations in electron amplification and read-out devices, particularly when dealing with high energy photons.
Innovation Solution
Incorporating an upstream ionization chamber to generate a current signal that corrects the output signal from a downstream detector chamber, thereby addressing non-linearities and sensitivity variations, and allowing for accurate measurement of the full energy spectrum of incident radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electron amplification device is used to detect high energy photons, then the detection capability is improved, but non-linearities and sensitivity variations occur that reduce measurement precision
Solution Approach 1:
The detector is divided into two separate chambers: an ionization chamber for accurate dose measurement and a detector chamber for radiation detection. This segmentation allows each chamber to perform its specialized function optimally, with the ionization chamber providing linear dose measurement and the detector chamber providing detection capability, thereby resolving the contradiction between detection capability and measurement precision
Solution Approach 2:
An upstream ionization chamber is introduced as an intermediary component that measures the incident radiation dose and generates correction factors. This intermediary provides accurate reference measurements that compensate for non-linearities in the electron amplification device, enabling both high detection capability and precise dosimetric measurements
2Measurement precision
If an upstream ionization chamber is added to correct for non-linearities, then dosimetric precision is improved, but device complexity increases
Solution Approach 1:
The upstream ionization chamber serves multiple functions: it acts as a radiation filter, a dose measurement device, and a reference for generating correction factors. By making this component multi-functional, the patent achieves improved dosimetric precision without proportionally increasing device complexity, as the same structure performs multiple critical roles
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 approach enhances the accuracy of radiation detection by correcting for non-linearities and sensitivity issues, resulting in improved dosimetric precision and more accurate image frames of irradiated objects.
Implementation Method 1
measuring an ionization current between a first electrode and a second electrode induced by incident radiation
Implementation Method 2
a converter unit adapted to convert incident radiation into electrons
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
A detector (100) comprises an upstream ionization chamber (110), a downstream detector chamber (120) and a signal processor (160). The ionization chamber (110) comprises a first electrode (111), a second electrode (112) and an ionization chamber gas (114). The detector chamber (120) comprises a converter unit (130) adapted to convert incident radiation (6) into electrons (8), an electron amplification device (140) adapted to produce further electrons (9) from the electrons (8), a read-out device (150) adapted to generate a signal representative of the incident radiation (6),and a detector chamber gas (121). The signal processor (160) is adapted to generate a corrected signal by processing the signal representative of the incident radiation (6) based on a current signal representative of an ionization current measured between the first electrode (111) and the second electrode (112) and induced by the incident radiation (6).