&lt;i&gt;In Situ&lt;/i&gt; Gamma Spectrometry Intercomparison in Fukushima, Japan

Mikami, Shuichi; Sato, Shoji; Hoshide, Yoshifumi; Sakamoto, R.; Okuda, Naotoshi; Saitô, Kimiaki

doi:10.5453/jhps.50.182

Cited by 15 publications

(3 citation statements)

References 4 publications

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“…Checking the accuracy of IGS measurements. Sampling and testing sites IGS techniques have been tested in numerous studies and through inter-comparison [12,[25][26][27] where they have shown their potential for complementing or even replacing the conventional soil sampling approach and subsequent laboratory gamma analysis in environmental monitoring. As cited in previous sections, the main drawback of the IGS technique is related to the lack of knowledge of the radionuclide depth distribution.…”

Section: Resultsmentioning

confidence: 99%

In situ gamma spectrometry using a portable HPGe detector. Radiological characterisation and environmental surveillance around an operating nuclear power plant. Possibilities and limits.

Corbacho

Baeza

2022

J. Radiol. Prot.

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In situ technique for measuring radionuclides in the soil using a portable Ge detector is a highly versatile tool for both the radiological characterization and for the monitoring of operating nuclear power plants. The main disadvantage of this technique is related to the lack of knowledge of the geometry of the source whose activity concentration is to be determined. However, its greatest advantage is the high spatial representability of the samples and the lower time and resource consumption than gamma spectrometry lab measurements. In this study, the possibilities and limits offered by in situ gamma spectrometry with a high resolution gamma portable detector in two common uses are shown: First, the radiological background characterization and its relationship with the geology of an area of 2700 km2 are assessed; Secondly, its potential for monitoring man-made activity concentration in soils located around an operating nuclear power plant in Spain for surveillance purposes is evaluated. Finally, high accuracy radiation maps have been prepared from the measurements carried out. These radiation maps are essential tools to know the radioactive background of an area, especially useful to assess artificial radioactive deposits produced after a nuclear accident or incident.

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Section: Resultsmentioning

confidence: 99%

In situ gamma spectrometry using a portable HPGe detector. Radiological characterisation and environmental surveillance around an operating nuclear power plant. Possibilities and limits.

Corbacho

Baeza

2022

J. Radiol. Prot.

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“…For data quality analysis, the coefficient of variation (CV) (Becegato et al, 2008;Mikami et al, 2015) of the obtained values was calculated, according to equation 4:…”

Section: Data Aquisitionmentioning

confidence: 99%

The use of in situ Gamma-Ray Spectrometry to Assess the Environmental Impacts of Intensive Agriculture in terms of Geochemical Mobility in soil and waters

Stanfoca Casagrande,

Moreira,

Moreira Furlan

et al. 2024

Geofis Int

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The concentration and mobility of metals in the lithosphere and hydrosphere are led by many physical-chemical parameters and processes from natural and anthropogenic origins, the last one resulting in impacts over many ecosystems around the World, including wetlands. These transitional zones, often characterized by the presence of hydric soils, adapted vegetation, and seasonal or permanent presence of surface water, are commonly under human pressure in terms of land use conversion and contamination, notably in agricultural production areas, where excess of nutrients/organic matter, pesticides, salts, sediments, heavy metals and radionuclides (originated from inorganic fertilizers) can substantially alter the ecological balance of those ecosystems. Thus, this study aimed to evaluate the agricultural impact over a tropical geographically isolated wetland in the Brazilian Cerrado by the analysis of geochemical mobility and interaction between surface and groundwater through in situ gamma-ray spectrometry and hydraulic conductivity measurements. The results demonstrated that the margins of this diabase-derived soil wetland are one of the most important and critical compartments due to its capacity of metal immobilization and surface water infiltration, indicated especially by uranium concentrations. Thorium, in turn, was most related to colluvial transport from slopes to the center of wetland. It was also corroborated by low hydraulic conductivity zones as a result of soil compaction due to heavy agricultural machinery and increase in runoff fluxes. Thus, this methodology could be used as an initial fast screening method in wetlands under other climatic and geological/pedological contexts to evaluate the local hydrogeochemical dynamics and impacts of agricultura.

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“…According to the decontamination guidelines based on practical actions stemming from the decontamination pilot project (JAEA 2015), diverse decontamination actions have been extensively conducted to reduce the dose rate around residential districts and to restore the environment of Fukushima Prefecture. In parallel, the mapping project (Saito et al 2015, Mikami et al 2015a, 2015b) is building a detailed deposition map around the FDNPP from the measurement of radioactivity in the ground and ambient dose rate at 1 m above the ground.…”

Section: Introductionmentioning

confidence: 99%

Assessment of radioactive cesium deposition using ground-based gamma-ray spectrometry with a LaBr₃(Ce) detector

Lim²,

Hitomi

et al. 2019

J. Radiol. Prot.

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Ground-based gamma-ray spectrometry using a LaBr3(Ce) detector was conducted to assess radioactive cesium deposition in soil contaminated by the accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP) in Japan. Five sites, including a reference site with relatively low contamination, were selected as having different levels of ambient dose rate due to significant effects of radioactive fallout of 134Cs and 137Cs. According to ICRU Report 53, the radioactivity in the ground and dose rate at 1 m above the ground were determined from the measured net count rates of gamma-rays induced from radioactive cesium. Because the radioactivity and dose rate depended on the depth profile of radioactive cesium in the ground, a database of possible radioactivity and dose rate could be established according to several depth distributions. A new approach to estimate the depth profile was then developed by directly calculating dose rates of 134Cs and 137Cs at the same geometry through dose rate spectroscopy and comparing them with the database of possible dose rates of radioactive cesium. Once the depth profile was determined, radioactivity was estimated from the database depending on the depth profile in the ground. The activity ratio between two radioactive cesium was shown to average about 0.112, in December 2017. It was in good agreement with the originally same released amount of 134Cs and 137Cs at the time of the FDNPP accident, when physical decay correction was applied to the results of the radioactivity assessment.

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<i>In Situ</i> Gamma Spectrometry Intercomparison in Fukushima, Japan

Cited by 15 publications

References 4 publications

In situ gamma spectrometry using a portable HPGe detector. Radiological characterisation and environmental surveillance around an operating nuclear power plant. Possibilities and limits.

In situ gamma spectrometry using a portable HPGe detector. Radiological characterisation and environmental surveillance around an operating nuclear power plant. Possibilities and limits.

The use of in situ Gamma-Ray Spectrometry to Assess the Environmental Impacts of Intensive Agriculture in terms of Geochemical Mobility in soil and waters

Assessment of radioactive cesium deposition using ground-based gamma-ray spectrometry with a LaBr₃(Ce) detector

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<i>In Situ</i> Gamma Spectrometry Intercomparison in Fukushima, Japan

Cited by 15 publications

References 4 publications

In situ gamma spectrometry using a portable HPGe detector. Radiological characterisation and environmental surveillance around an operating nuclear power plant. Possibilities and limits.

In situ gamma spectrometry using a portable HPGe detector. Radiological characterisation and environmental surveillance around an operating nuclear power plant. Possibilities and limits.

The use of in situ Gamma-Ray Spectrometry to Assess the Environmental Impacts of Intensive Agriculture in terms of Geochemical Mobility in soil and waters

Assessment of radioactive cesium deposition using ground-based gamma-ray spectrometry with a LaBr3(Ce) detector

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Product

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Assessment of radioactive cesium deposition using ground-based gamma-ray spectrometry with a LaBr₃(Ce) detector