Method and system for detecting a change in radiological activity

A two-stage filtering process with an averaging filter and MACD indicator enhances radiological detection sensitivity and response time, addressing low signal-to-noise ratios and high-frequency fluctuations in conventional systems.

FR3162528B1Active Publication Date: 2026-05-22COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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Patent Information

Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
Filing Date
2024-05-24
Publication Date
2026-05-22

AI Technical Summary

Technical Problem

Conventional radiological detection systems face challenges in sensitivity and specificity due to low signal-to-noise ratios, particularly in detecting rapid changes in radiological activity, and are hindered by high-frequency fluctuations, leading to suboptimal response times and accuracy in identifying radioactive sources.

Method used

A method involving a two-stage filtering process using an averaging filter followed by a MACD (Moving Average Convergence Divergence) indicator and a threshold test to detect changes in radiological activity, ensuring sensitivity to slight and rapid changes while robust against high-frequency fluctuations.

Benefits of technology

The method effectively detects changes in radiological activity with high sensitivity and rapid response, minimizing false alarms and maintaining accuracy by adaptively adjusting to background noise levels.

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Abstract

The invention relates to a method for processing a detection signal delivered by a radiation detector, comprising: the calculation of reference variation indicators during a phase of detector exposure to radiological background noise alone; the calculation of a current variation indicator ( ) during a phase of potential detector exposure to a change in radiological activity; the comparison (TST) of the current variation indicator ( ) to a threshold function of a statistic ( ) of a distribution of the reference variation indicators; and wherein the calculation of each of the reference variation indicators and the current variation indicator comprises: a smoothing (F1) of a pulse count signal ( ) of pulses contained in the detection signal; the calculation (IC) of a difference ( ) between a simple exponential smoothing and a double exponential smoothing of the smoothed count signal ( ). Figure for the abstract: Figure 2
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