การพัฒนาอุปกรณ์โหลดหัววัดรังสีใต้น้ำทะเลจังหวัดสงขลา

Somboon Toautachone; Sukjai Kiatisakwatana

doi:10.60136/bas.v12.2023.393

Authors

Somboon Toautachone Nuclear Engineering and Maintenance Group, Regulatory Technical Support Division, Office of Atoms for Peace
Sukjai Kiatisakwatana Nuclear Engineering and Maintenance Group, Regulatory Technical Support Division, Office of Atoms for Peace

DOI:

https://doi.org/10.60136/bas.v12.2023.393

Keywords:

Sodium Iodide Scintillation Detector (NaI), Gamma Radiation, Background, Underwater, Loading Device

Abstract

Office of Atoms for Peace (OAP) has started to install underwater radiation monitoring station after nuclear disaster at Fukushima Daiichi nuclear power plant, Japan, in 2011, to measure gamma radiation under seawater. Measured data can be useful for nuclear and radiation safety regulation for the purpose of human and environmental safety. An important problem happened to the under-seawater radiation monitoring station is the leakage of seawater entered into sodium iodide scintillation detector (NaI) causing damages to components inside NaI detector such as dodium iodide crystal, photomultiplier Tube (PMT), and tube base. To solve that problem, OAP has designed and developed a loading device for underwater radiation detector and so on through installation, system testing, and calibration with Cs-137. Result from measured data shown that gamma radiation background (BKG) under seawater at Songkhla province is approximately 10 nSv/h. After installation of loading device, measuring system can be operated efficiently and sustainably and it can be employed as prototype for design and development in future.

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