Analysis of radionuclide detection events on the International Monitoring System

Goodwin, Matthew A.; Chester, Daniel; Britton, R.; Davies, A. V.; Border, Joshua

doi:10.1016/j.jenvrad.2021.106789

Cited by 12 publications

(3 citation statements)

References 11 publications

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“…The environment of the remote monitoring system of the digital agricultural greenhouse is complex, many factors need to be considered, and the environmental parameters interact, which makes the design of the monitoring system very challenging. The PID control algorithm and switch control method used in the monitoring system cannot cope with the multivariable and strong coupling characteristics of the greenhouse [7]. Given the limitations mentioned earlier, this paper suggests utilizing the particle swarm optimization algorithm, which can improve optimization speed and requires fewer parameter settings.…”

Section: Design System Particle Swarm Optimization Fuzzy Control Algo...mentioning

confidence: 99%

Remote Monitoring System of Digital Agricultural Greenhouse Based on Internet of Things

2023

SCPE

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In the actual operation process of the conventional digital agricultural greenhouse monitoring system, there are problems such as limited monitoring scope and large deviation between the monitoring results and the actual situation of the greenhouse. To solve this problem, a new remote monitoring system is proposed by introducing the technology of the Internet of Things. On the basis of the completion of the hardware design of the remote monitoring system, the optimal fusion data value of the remote monitoring of the digital agricultural greenhouse is obtained by establishing the monitoring data fusion model. The particle swarm optimization fuzzy control algorithm is designed to optimize the adaptive remote monitoring process of the system dynamically. The Internet of Things technology is used to deploy the remote monitoring system of digital agricultural greenhouses online to fully ensure the quality and timeliness of the remote monitoring system. The test results show that the new system can significantly improve the greenhouse remote monitoring deviation, and the monitoring value is close to the actual value.

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Section: Design System Particle Swarm Optimization Fuzzy Control Algo...mentioning

confidence: 99%

Remote Monitoring System of Digital Agricultural Greenhouse Based on Internet of Things

2023

SCPE

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“…The new generation of noble gas systems all employ the beta-gamma coincidence method. Some of these systems incorporate high-resolution spectrometers, enhancing their capabilities for accurate detection and analysis for metastable radioxenon isotopes (Goodwin et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Decay Corrections in Isotopic Ratio Estimation Based on the Activity Concentration Profile During Sampling for CTBT-Relevant Radionuclides with Short Half-Life

Liu,

Kunkle,

Schoemaker

et al. 2024

Preprint

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Isotopic activity ratios of the relevant radionuclides, detected at radionuclide stations within the international monitoring system (IMS) for the Comprehensive Nuclear-Test-Ban Treaty, play a crucial role in characterizing release events under assumed scenarios. This analysis involves radioactive gases initially released from an underground nuclear event resulting in radionuclide concentrations in a plume of air passing over an IMS station that are subsequently sampled by that station. Modeling this requires considering the post-shot radionuclide evolution of an assumed underground nuclear explosion, the simulations of atmospheric transport modelling, and, finally, the sample measurement. Activities collected in the samples are determined through spectrum analysis of sample measurements, and the activity concentrations are then estimated by assuming a constant concentration during sampling. While this assumption holds for radionuclides with relatively longer half-lives, that is, exceeding 7 times the sampling duration, challenges arise for the isotopes with short half-lives, such as 135Xe with half-life of 9.14 hours compared to the 12-hour collection duration for some noble gas systems. Therefore, this study investigates the decay correction during sampling using two approaches, 1) Interval constant concentration: the collection duration is divided into multiple intervals with a constant concentration assumed in each interval; 2) Decaying concentration: the activity collected in the sample is derived based on an analytical solution to the ordinary differential equations of the activity decay and ingrowth. The impact of these approaches on isotopic activity ratios is demonstrated in three cases with short half-lives, 140Ba/140La, and 133mXe/133Xe, and 135Xe/133Xe.

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“…For example, Xe can be traced as an indicator of fuel failure in light water reactors for off-gas sensing in molten salt reactors [3] and as an early indicator of fuel failure in the coolant loop of the proposed generation IV gas-cooled fast reactors (GCFRs) [4,5]. Being one of the most prominent and mobile gaseous fission products, the occurrence of Xe and its isotopes can provide temporal and compositional information on the release following a nuclear detonation or an accident occurring at a nuclear facility [6,7]. The sensitive detection of various Xe isotopes at standoff distances has been employed to detect nuclear detonations and is an important method for verification of the Comprehensive Test Ban Treaty [8].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Laser-Excited Optical Emission of Xe under Loose-Focusing Conditions

Burger,

Latty,

Frigerio

et al. 2023

Sensors

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The optical filament-based radioxenon sensing can potentially overcome the constraints of conventional detection techniques that are relevant for nuclear security applications. This study investigates the spectral signatures of pure xenon (Xe) when excited by ultrafast laser filaments at near-atmosphericpressure and in short and loose-focusing conditions. The two focusing conditions lead to laser intensity differences of several orders of magnitude and different plasma transient behavior. The gaseous sample was excited at atmospheric pressure using ∼7 mJ pulses with a 35 fs pulse duration at 800 nm wavelength. The optical signatures were studied by time-resolved spectrometry and imaging in orthogonal light collection configurations in the ∼400 nm (VIS) and ∼800 nm (NIR) spectral regions. The most prominent spectral lines of atomic Xe are observable in both focusing conditions. An on-axis light collection from an atmospheric air–Xe plasma mixture demonstrates the potential of femtosecond filamentation for the remote sensing of noble gases.

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Analysis of radionuclide detection events on the International Monitoring System

Cited by 12 publications

References 11 publications

Remote Monitoring System of Digital Agricultural Greenhouse Based on Internet of Things

Remote Monitoring System of Digital Agricultural Greenhouse Based on Internet of Things

Decay Corrections in Isotopic Ratio Estimation Based on the Activity Concentration Profile During Sampling for CTBT-Relevant Radionuclides with Short Half-Life

Ultrafast Laser-Excited Optical Emission of Xe under Loose-Focusing Conditions

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