Imaging of plutonium particles using a CCD-camera-based alpha-particle imaging system

Morishita, Yuki

doi:10.1016/j.nima.2018.12.023

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…CCD detectors have been widely used in industry process control, scientific research, astronomical observation, environmental monitoring and transportation [1][2][3][4][5][6][7][8]. As a "solid state" imaging detector, CCD detectors have the advantages in small size, ultralow noise, large dynamic range, and broad spectral response.…”

Section: Introductionmentioning

confidence: 99%

Research on the electrostatic discharge damage of CCD detectors

Lai

Shen²,

Li³

et al. 2023

AOPC 2022: Optoelectronics and Nanophotonics

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The electrostatic discharge (ESD) effect and damage mechanism of Charge Coupled Device (CCD) is investigated. Transmission line pulsing (TLP) tests have been experimented to identify the instantaneous I-V characteristics of CCD detectors under ESD stress. The TLP I-V curves of the ports with or without ESD protection show different characteristics, which indicate that the electrostatic discharge is a capacitor charging process for the ports without protection. The ports with smaller capacitance such as the transfer clock and readout clocks are the weakness against ESD events. The electrostatic damage site is further analyzed using emission microscopy (EMMI) and Focused Ion beam technology (FIB), revealing that the electrostatic damage mechanism of CCD.

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Section: Introductionmentioning

confidence: 99%

Research on the electrostatic discharge damage of CCD detectors

Lai

Shen²,

Li³

et al. 2023

AOPC 2022: Optoelectronics and Nanophotonics

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“…Moreover, the IP signal intensity gradually decreases after exposure (fading effect) 10 , making it difficult to quantify the radioactivity of plutonium particles without correction of the fading effect. Additionally, the spatial resolution is worse than a CCD-camera based alpha imager for PuO 2 particle imaging 11 . On one hand, because the IP is sensitive to alpha, beta, and gamma rays, it is difficult to distinguish alpha particles from the background beta particles and gamma rays.…”

Section: Introductionmentioning

confidence: 99%

Plutonium dioxide particle imaging using a high-resolution alpha imager for radiation protection

Morishita

Kurosawa

Yamaji

et al. 2021

Sci Rep

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The internal exposure of workers who inhale plutonium dioxide particles in nuclear facilities is a crucial matter for human protection from radiation. To determine the activity median aerodynamic diameter values at the working sites of nuclear facilities in real time, we developed a high-resolution alpha imager using a ZnS(Ag) scintillator sheet, an optical microscope, and an electron-multiplying charge-coupled device camera. Then, we designed and applied a setup to measure a plutonium dioxide particle and identify the locations of the individual alpha particles in real time. Employing a Gaussian fitting, we evaluated the average spatial resolution of the multiple alpha particles was evaluated to be 16.2 ± 2.2 μmFWHM with a zoom range of 5 ×. Also, the spatial resolution for the plutonium dioxide particle was 302.7 ± 4.6 µmFWHM due to the distance between the plutonium dioxide particle and the ZnS(Ag) scintillator. The influence of beta particles was negligible, and alpha particles were discernible in the alpha–beta particle contamination. The equivalent volume diameter of the plutonium dioxide particle was calculated from the measured count rate. These results indicate that the developed alpha imager is effective in the plutonium dioxide particle measurements at the working sites of nuclear facilities for internal exposure dose evaluation.

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