Radiation Detector with Dual Amplifier Modes for Wide Dynamic Range
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current radiation detectors either saturate in high radiation fields, becoming useless, or fail to detect lower intensity sources and gamma-ray spectra, necessitating the need for a device capable of measuring a wide range of radiation levels and identifying radiation sources.
Innovation Solution
A radiation detector comprising a scintillator optically coupled to a photodiode, with a bias voltage source and both charge and current sensitive amplifiers, allowing for signal generation indicative of charge and current levels, enabling operation across a large dynamic range and gamma-ray spectroscopy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Geiger counter is used to detect low levels of gamma radiation, then detection sensitivity at low levels is improved, but the detector saturates and becomes useless in high radiation fields
Solution Approach 1:
The patent implements dynamic switching between charge-sensitive and current-sensitive amplification modes based on radiation intensity levels. The system automatically adapts its measurement mode: using charge-sensitive amplification for low-level radiation detection and current-sensitive amplification for high-level radiation measurement, thereby maintaining reliability across the full dynamic range without saturation
Solution Approach 2:
The patent changes the operational parameters of the photodiode readout system by switching between two distinct amplification configurations. The charge-sensitive amplifier operates with high gain for low-level signals, while the current-sensitive amplifier operates with appropriate scaling for high-level signals, allowing the system to maintain measurement precision across varying radiation intensities
2Reliability
If silicon semiconductor diode or ionization chamber is used to measure very high radiation fields, then measurement capability at high levels is improved, but the ability to detect lower intensity sources is lost
Solution Approach 1:
The system dynamically selects the appropriate amplification mode based on the radiation intensity being measured. For high-level radiation fields, the current-sensitive amplifier provides stable measurement capability, while for lower intensity sources, the charge-sensitive amplifier delivers the necessary detection precision, thus achieving both high-level reliability and low-level sensitivity
3Device complexity
If a single detector type is used, then device simplicity is maintained, but the ability to measure both low and high radiation levels with gamma-ray spectra is lost
Solution Approach 1:
The patent creates a universal radiation detection system that can perform multiple functions: low-level radiation detection with spectra measurement via charge-sensitive amplification, and high-level radiation measurement via current-sensitive amplification. This multi-functional approach allows a single detector system to replace multiple specialized detectors while maintaining adaptability across the full dynamic range
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
Enables accurate measurement of radiation intensity across a wide range, from low to high levels, and gamma-ray spectra analysis, enhancing the ability to identify radiation sources and providing a consistent and accurate measure of radiation intensity.
Implementation Method 1
a scintillator and a photodiode optically coupled to the scintillator
Implementation Method 2
a photodiode optically coupled to the scintillator
Data Source
AI summary
According to one embodiment, a radiation detector comprises a scintillator and a photodiode optically coupled to the scintillator. The radiation detector also includes a bias voltage source electrically coupled to the photodiode, a first detector operatively electrically coupled to the photodiode for generating a signal indicative of a level of a charge at an output of the photodiode, and a second detector operatively electrically coupled to the bias voltage source for generating a signal indicative of an amount of current flowing through the photodiode.