Sea bottom gamma ray measurement by NaI(Tl) scintillation spectrometers installed on manned submersibles, ROV and sea bottom long term observatory

Hattori, Mutsuo; Okano, M.; Togawa, O.

doi:10.1109/ut.2000.852545

Cited by 6 publications

(7 citation statements)

References 1 publication

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“…Shinkai 2000 has been equipped with a γ‐ray spectrometer using a NaI (Tl) scintillator as the sensor since 1997, and, thus, in situ γ‐ray spectrometry has been available for almost all dives (Hattori & Okano 1998, 2001; Hattori et al . 2000).…”

Section: Methodsmentioning

confidence: 99%

Geological and microbial anomalies in the extinct submarine volcano, Shiribeshi Seamount, in the eastern margin of the Japan Sea

Ogawa¹,

Takeuchi²,

Hattori³

et al. 2002

Island Arc

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The manned submersible Shinkai 2000 investigated yellow patches on the near‐summit slope of Shiribeshi Seamount in the Japan Sea. Yellowish patches are often associated with seepage, and the possibility of seepage at Shiribeshi Seamount was tested by the following four lines of observation: (i) high subsurface temperature was measured at a ring‐like patch, although no increase in subsurface temperature was observed at other patches; (ii) high gamma ray (γ‐ray) intensity from the thorium series was recorded in the patch zone; (iii) the yellowish deposit was composed of calcite, quartz and amorphous iron compound, as seen at the yellowish patches in other seeps and volcanoes; (iv) lipid phosphate, a measure of microbial abundance, in sediments of the ring‐like patch was determined, and the recorded microbial abundance was higher inside the patch than outside it. The four lines of observation are explained consistently by postulating that the seepage of warm fluid contained Fe and γ‐ray sources. A hydrothermal origin of the yellow patches is not ruled out for the extinct but young (0.9 Ma) arc volcano.

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Section: Methodsmentioning

confidence: 99%

Geological and microbial anomalies in the extinct submarine volcano, Shiribeshi Seamount, in the eastern margin of the Japan Sea

Ogawa¹,

Takeuchi²,

Hattori³

et al. 2002

Island Arc

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“…Mobile γ-ray spectrometry is a well -established technique in environmental radioactivity measurements, which can provide results in harsh or remote environments (ICRU 1994), especially when sampling is difficult or when information is needed in a very short time scale. Nowadays mobile spectrometers are rather simple to deploy in the field and can be carried by humans (Kock and Samuelsson 2011, Cresswell et al 2013, 2018, mounted on robotic instruments (Jilek et al 2016), air vehicles (Simon andGraham 1998, Kock andSamuelsson 2011), drones (Kurvinen et al 2005, Pöllänen et al 2009, or dive into deep oceans aboard marine submersibles (Hattori 2000, Hattori et al 2001, Tsabaris et al 2011, Androulakaki et al 2016. Depending on the application, different types of detectors can be used, such as scintillators (e.g.…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of a mobile γ spectrometer and its field deployment for in situ radioactivity measurements

Mertzimekis¹,

Andrikopoulos²,

Fakiola³

et al. 2021

NUCET

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A mobile γ–ray spectrometer (AMESOS) has been developed using a 3”×3” NaI(Tl) detector, a custom–made mounting holder, and portable electronics to perform in situ measurements of radioactivity. The spectrometer was calibrated using standard point sources and its absolute efficiency was determined. As a field test operation, AMESOS was deployed on the premises of the University of Athens Zografou campus focusing on estimating the NORM levels. Data were analyzed and used to create radiological maps for the metropolitan UoA campus for the first time. Besides natural radioactivity levels, trace concentrations of 137Cs were also detected, attributed to the Chernobyl fallout in Greece. An overall steady performance of the spectrometer was observed throughout the field operation. AMESOS is ready to be deployed for in situ studies of environmental radioactivity and radwaste management.

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“…A NaI gamma ray spectrometer was specially designed for deep sea radioactivity (Hattori et al 2000) and it was used extensively for studies to map the radiation intensities at the sea floor Okano 2001, 2002). In this Chapter, this NaI spectrometer was used to investigate the radioactivity in the sea water at the sea floor around hydrothermal active area.…”

Section: Introductionmentioning

confidence: 99%

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

Toyoda

Banerjee

Kumagai

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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The dose rates in sea water in the Southern Mariana Trough sea floor hydrothermal area were investigated. The dose rate in sea water was less than detection limit (about 0.1 mGy/year) near the sea surface while it was around 2 mGy/year at the sea floor of hydrothermal area, where those levels of dose rates will be negligible for ESR (electron spin resonance) dating of barite of sulfide deposits. During the dive by a submarine vehicle, there were three locations at which the level of dose rate increases more than ten times as much as the usual level. One was very close to a hydrothermal vent, but no hydrothermal activities were found near the other locations.

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Sea bottom gamma ray measurement by NaI(Tl) scintillation spectrometers installed on manned submersibles, ROV and sea bottom long term observatory

Cited by 6 publications

References 1 publication

Geological and microbial anomalies in the extinct submarine volcano, Shiribeshi Seamount, in the eastern margin of the Japan Sea

Geological and microbial anomalies in the extinct submarine volcano, Shiribeshi Seamount, in the eastern margin of the Japan Sea

Development and characterization of a mobile γ spectrometer and its field deployment for in situ radioactivity measurements

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

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