A compact NaI(Tl) with avalanche photodiode gamma spectrometer for in situ radioactivity measurements in marine environment

2021 ◽  
Vol 92 (3) ◽  
pp. 033301
Author(s):  
Zhenyu Sun ◽  
Fan Zhou ◽  
Zhe Cao ◽  
Ziheng Zhou ◽  
Xiaohu Wang ◽  
...  
Keyword(s):  
Marine Environment ◽  
Avalanche Photodiode ◽  
Gamma Spectrometer ◽  
Radioactivity Measurements

Automated spectra analysis of in situ radioactivity measurements in the marine environment using NaI(Tl) detector

2018 ◽  
Vol 141 ◽  
pp. 88-94 ◽  
Author(s):  
Jin Wang ◽  
Yingying Zhang ◽  
Dongyan Liu ◽  
Bingwei Wu ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Marine Environment ◽  
Spectra Analysis ◽  
Radioactivity Measurements

An autonomous in situ detection system for radioactivity measurements in the marine environment

2008 ◽  
Vol 66 (10) ◽  
pp. 1419-1426 ◽  
Author(s):  
C. Tsabaris ◽  
C. Bagatelas ◽  
Th. Dakladas ◽  
C.T. Papadopoulos ◽  
R. Vlastou ◽  
...  
Keyword(s):  
Marine Environment ◽  
Detection System ◽  
In Situ Detection ◽  
Radioactivity Measurements

Effects of corrosion on a steel bowstring bridge in marine environment: A case-study of assessment and retrofit

2021 ◽  
Vol 16 (4) ◽  
pp. 121-137
Author(s):  
Michele Fabio Granata
Keyword(s):  
Corrosion Protection ◽  
Marine Environment ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
In Situ Tests ◽  
Limit States ◽  
Intervention Measures ◽  
Near Future

The case-study of a steel bowstring bridge set in a marine environment and highly damaged by corrosion is presented. The bridge was built in 2004 and was repainted for corrosion protection in 2010. Despite the recent construction and the maintenance interventions, many structural elements like hangers are highly damaged by corrosion with decreasing performance in terms of serviceability and ultimate limit states. A deep investigation was carried out in order to assess the bridge and to establish the necessary retrofit actions to be carried out in the near future. In-situ tests reveal the reduced performance of the original steel in terms of strength and corrosion protection, together with the inefficiency of the successive maintenance interventions. The paper presents assessment of the bridge and retrofit measures, including replacement of the hangers and galvanization through thermal spray coating technology, in order to increase its service life. The results of the investigations and the intervention measures are outlined and discussed.

Development and deployment of an autonomous sensor for the in-situ radioactivity measurement in the marine environment

2018 ◽  
Vol 142 ◽  
pp. 181-186 ◽  
Author(s):  
Yingying Zhang ◽  
Bingwei Wu ◽  
Dongyan Liu ◽  
Ying Zhang ◽  
Yan Cheng
Keyword(s):  
Marine Environment ◽  
Radioactivity Measurement ◽  
Autonomous Sensor

scholarly journals In Situ Miniaturised Solid Phase Extraction (m-SPE) for Organic Pollutants in Seawater Samples

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
B. Abaroa-Pérez ◽  
G. Sánchez-Almeida ◽  
J. J. Hernández-Brito ◽  
D. Vega-Moreno
Keyword(s):  
Solid Phase Extraction ◽  
Organic Pollutants ◽  
Marine Environment ◽  
Persistent Organic Pollutants ◽  
Solid Phase ◽  
In Situ Monitoring ◽  
Phase Extraction ◽  
Polycyclic Aromatic ◽  
Seawater Samples

Solid phase extraction (SPE) is a consolidated technique for determining pollutants in seawater samples. The current tendency is to miniaturise systems that extract and determine pollutants in the environment, reducing the use of organic solvents, while maintaining the quality in the extraction and preconcentration. On the other hand, there is a need to develop new extraction systems that can be fitted to in situ continual monitoring buoys, especially for the marine environment. This work has developed a first model of a low-pressure micro-SPE (m-SPE) for persistent organic pollutants (POPs) that can be simply applied to in situ monitoring in the marine environment. This system reduces the volumes of sample and solvents required in the laboratory in comparison with conventional SPE. In the future, it could be used in automated or robotic systems in marine technologies such as marine gliders and oceanographic buoys. This system has been optimised and validated to determine polycyclic aromatic hydrocarbons (PAH) in seawater samples, but it could also be applied to other kinds of persistent organic pollutants (POPs) and emerging pollutants.

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