Radioactive Source Detection via Multi-Detector Correlation Analysis
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Solution Overview
Problem
Existing methods for detecting moving radioactive sources are limited by high false alarm rates and reduced detection capabilities due to conventional thresholding techniques, which are not effectively addressed by existing systems.
Innovation Solution
A method that calculates correlation products from simultaneous detection signals across multiple detectors, using statistical averages and standard deviations to determine the presence and characteristics of a moving radioactive source, eliminating the need for conventional thresholding and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thresholding techniques are used for detecting radioactive sources, then the detection system can trigger alarms, but the false alarm rate increases and detection capabilities are reduced
Solution Approach 1:
The patent combines the outputs of multiple detectors through correlation analysis rather than treating them independently. By merging the detection signals and analyzing their temporal correlations, the system achieves more reliable source detection while reducing false alarms that occur when individual detectors trigger independently.
Solution Approach 2:
The system uses feedback by continuously monitoring the correlation between detector signals over time. The correlation analysis provides feedback about the consistency of signals across multiple detectors, allowing the system to distinguish between genuine radioactive sources and random background fluctuations, thereby reducing false alarms.
2Device complexity
If independent detection of each measurement channel is performed with a priori thresholding, then the detection process is simplified, but the intrinsic detection capabilities of the detectors are limited
Solution Approach 1:
The patent introduces dynamic correlation analysis that adapts to the temporal patterns of radioactive sources moving through the detector array. Rather than using static thresholds, the system dynamically evaluates the correlation of signals across detectors over time, enhancing detection capability while maintaining manageable complexity through systematic processing.
3Measurement precision
If the number of detectors N is increased to improve detection sensitivity, then the detection capability improves, but the number of correlation products NR increases significantly
Solution Approach 1:
The patent segments the correlation analysis into manageable components by processing signals from N detectors through a systematic correlation framework. The method divides the complex multi-detector analysis into pairwise correlations that can be computed efficiently, reducing the computational burden while maintaining the benefits of using multiple detectors for improved sensitivity.
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 significantly reduces false alarm rates and enhances detection capabilities by using correlation analysis to identify moving sources, providing more accurate speed and intensity calculations while maintaining low false alarm rates and non-detection rates.
Implementation Method 1
Nt sets of N signals detected simultaneously by the N detectors over a same duration Δt, a pulse count value representing a number of pulses detected by a detector
Data Source
AI summary
The invention relates to a method for detecting a radioactive source which moves along a linear path substantially parallel to an alignment of N detectors, the method including: forming NxNt pulse count values Mi,t (i=1, 2,..., N and t=1, 2,..., Nt) from NxNt detection signals output by the N detectors in the form of a series in time of Nt sets of N signals detected simultaneously by the N detectors over a same duration Δt, a pulse count value representing a number of pulses detected by a detector over a duration of Δt; and calculating, using a computer, a set of Nt correlation products Rt such that (I) (t=1, 2,..., NR) with (II), Nt being a very large whole number compared to N, a static mean (III) of NxNt count values such as (IV), and a condition of correlation for each correlation product Rt such that, if (V), a radioactive source is considered to have moved in front of the detectors, and if (VI), no source is considered to have moved in front of the detectors, K2 being a scalar, and (VII) being the standard deviation from the mean (III).