Gamma Ray Doses in Water Around Sea Floor Hydrothermal Area in the Southern Mariana Trough

Toyoda, Shin; Banerjee, Debabrata; Kumagai, Hitoshi; Miyazaki, Junichi; Ishibashi, Jun Ichiro; Mochizuki, Nobutatsu; Kojima, Soichi

doi:10.1007/978-4-431-54865-2_46

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…The most common ones involve the deployment of NaI(Tl) scintillators (see e.g. [6][7][8][9][10][11]), with the main limitation of such approaches residing in the generally poor energy resolution of the scintillator.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a CZT-based spectrometer for underwater operation via simulations and experiments

Siltzovalis,

Lagaki,

Madesis

et al. 2024

J. Inst.

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The harsh environmental conditions in the marine environment pose various constraints on developing efficient instruments to carry out long-term, in situ radioactivity measurements. In addition, the strong attenuation of γ-rays in the water medium, makes remote sensing of such radiation a challenging task. In the present work, we report on the efforts to find the optimal characteristics and deployment scenarios of a new prototype γ-ray instrument based on a small-size CZT crystal enclosed in seal-tight housing to be deployed for operation in large depths. Lab experiments and detailed Monte Carlo simulations were combined to validate the actual crystal dimensions, determine its efficiency and energy resolution, as well as establish the minimum detectable activity values of the instrument in different configurations and scenarios.

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Section: Introductionmentioning

confidence: 99%

Characterization of a CZT-based spectrometer for underwater operation via simulations and experiments

Siltzovalis,

Lagaki,

Madesis

et al. 2024

J. Inst.

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“…In these published experiments based on NaI(Tl) crystal in the depth from 110 meters to 6500 meters, the spectrometers usually have an energy range of about 100 keV to 1.8 ∼ 3.6 MeV, spectra of 240 to 2048 channels and a resolution of 7% to 10% [2,3,[7][8][9]. Moreover, only the gamma ray dose is counted without the energy spectrum in some experiments, such as an investigation in the Southern Mariana Trough [10].…”

Section: Introductionmentioning

confidence: 99%

Design of a Prototype in-situ Gamma-ray Spectrometer for Deep Sea

et al. 2020

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Research on the in-situ environment in deep sea is a new focus in marine science. In this work, a prototype in-situ gamma-ray spectrometer was designed in order to measure the gamma-ray spectrum of the environment at about 5000 meters underwater in the South China Sea. The new spectrometer consists of an NaI(Tl) crystal, a photomultiplier tube (PMT), and its electronics. The full digital processing method is implemented in the electronics system, including waveform digitization and digital filtering, to build a general readout platform for various scintillator material based gamma-ray detection. The prototype electronics system is comprised of three modules, which are responsible for analog signal conditioning and high-speed high-resolution waveform digitization, as well as digital filtering, data buffering and transferring based on the field programmable gate array (FPGA). Tests were also conducted to evaluate the system performance. The results indicate that this gamma-ray spectrometer prototype achieves energy range from 60 keV to 3 MeV and full width at half maxima (FWHM) resolutions of 7.5% at 662 keV and 8.8% at 511 keV, which are above the application requirement.

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Monitoring of the radioactivity in the marine environment: a White Paper - Part I

Lagaki,

Siltzovalis,

Madesis

et al. 2024

NUCET

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Radioactivity in the marine environment, although present since the Earth’s formation, is comparatively understudied in contrast to aerial and terrestrial environments. A thorough examination of the radioactivity levels in aquatic environments can establish a robust foundation for comprehending various geochemical processes and phenomena within the water column and near the seabed, and as a result estimate the impact of radioactivity on local ecosystems. To achieve this objective, in-situ, long-term, and continuous monitoring is required. The present part I of the white paper highlights the fundamentals of marine radioactivity, describes the main objectives of an ambitious EU-funded project (RAMONES: Radioactivity Monitoring in Ocean Ecosystems) and introduces the innovative aspects of the technology developed as novel solutions to open problems.

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Gamma Ray Doses in Water Around Sea Floor Hydrothermal Area in the Southern Mariana Trough

Cited by 3 publications

References 3 publications

Characterization of a CZT-based spectrometer for underwater operation via simulations and experiments

Characterization of a CZT-based spectrometer for underwater operation via simulations and experiments

Design of a Prototype in-situ Gamma-ray Spectrometer for Deep Sea

Monitoring of the radioactivity in the marine environment: a White Paper - Part I

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