Georgios Siltzovalis, Varvara Lagaki, Ioannis Madesis, Theo J Mertzimekis
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引用次数: 0
Abstract
A large-volume (4 cm3) monolithic CdZnTe detector was selected for a novel underwater γ-radiation sensing instrument for radioactivity measurements near the seabed. The focus of this paper was to characterize the detector to adapt to the challenges expected during underwater operation. Initially, its efficiency and energy resolution were determined experimentally. Then, two underwater laboratory experiments were utilized. The first compared the detector efficiency from measurements performed in the air and then underwater. A decrease in efficiency was observed for low energy γ-rays during the underwater measurement. The second experiment evaluated the sensitivity of the method in underwater detection of 40K. The results revealed the limitations of the detector in real-life measurement scenarios. Next, Monte Carlo simulations were performed, focusing on the marinization of the detector. Candidate materials were investigated for the manufacturing of the necessary underwater housing. From the analysis of the results and considering real-world challenges expected in the marine environment, an aluminum housing was found to be optimal for the instrument development. Finally, the most efficient placement of the instrument with regard to the surface of the seabed was determined considering the detection range and the efficiency of the setup. It was concluded that a horizontal placement was the most suitable one. The proposed CdZnTe instrument is expected to provide a novel solution for underwater radioactivity studies in deep ocean environments and operation under harsh conditions. The main advantages it can offer are: the good energy resolution and efficiency, which are necessary for efficient underwater radioactivity monitoring.
期刊介绍：
Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment.
The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria.
Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.
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