1
|
Lee S, Park J, Lee JS, Seo H, Ko GB, Seo JM, Kim SM. Comparative study on gamma-ray detectors for in-situ ocean radiation monitoring system. Appl Radiat Isot 2023; 197:110826. [PMID: 37094496 DOI: 10.1016/j.apradiso.2023.110826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 03/07/2023] [Accepted: 04/14/2023] [Indexed: 04/26/2023]
Abstract
Large-sized crystals and state-of-the-art photosensors are desirable to cope with low environmental radioactivity (e.g., 1-2 Bq∙m-3137Cs in surface seawater) for homeland security purposes. We compared the performances of two different gamma-ray detector assemblies, GAGG crystal + silicon photomultiplier (SiPM) and NaI(Tl) crystal + photomultiplier tube, for our mobile in-situ ocean radiation monitoring system. We performed energy calibration, followed by water tank experiments with varying the depth of a137Cs point source. Experimental energy spectra were compared with MCNP-simulated spectra with identical setup and the consistency was validated. We finally assessed the detection efficiency and minimum detectable activity (MDA) of the detectors. Both GAGG and NaI detectors exhibited favorable energy resolutions (7.98 ± 0.13% and 7.01 ± 0.58% at 662 keV, respectively) and MDAs (33.1 ± 0.0645 and 13.5 ± 0.0327 Bq∙m-3 for 24-h 137Cs measurement, respectively). Matching the geometry of the GAGG crystal with that of the NaI crystal, the GAGG detector outperformed the NaI detector. The results demonstrated that the GAGG detector is potentially advantageous over the NaI detector in detection efficiency and compactness.
Collapse
Affiliation(s)
- Seungeun Lee
- Department of Biomedical Sciences, Seoul National University, 103 Daehak-Ro, Jongno-Gu, Seoul, 03080, Republic of Korea
| | - Junsung Park
- Department of Quantum System Engineering, Jeonbuk National University, 567 Baekje-Daero, Deokjin-Gu, Jeonju-Si, Jeollabuk-Do, 54896, Republic of Korea
| | - Jae Sung Lee
- Department of Biomedical Sciences, Seoul National University, 103 Daehak-Ro, Jongno-Gu, Seoul, 03080, Republic of Korea; Brightonix Imaging Inc., 25 Yeonmujang 5ga-Gil, Seongdong-Gu, Seoul, 04782, Republic of Korea
| | - Hee Seo
- Department of Quantum System Engineering, Jeonbuk National University, 567 Baekje-Daero, Deokjin-Gu, Jeonju-Si, Jeollabuk-Do, 54896, Republic of Korea
| | - Guen Bae Ko
- Brightonix Imaging Inc., 25 Yeonmujang 5ga-Gil, Seongdong-Gu, Seoul, 04782, Republic of Korea
| | - Jung-Min Seo
- Maritime ICT & Mobility Research Department, Korea Institute of Ocean Science and Technology, 385 Haeyang-Ro, Yeongdo-Gu, Busan, 49111, Republic of Korea
| | - Soo Mee Kim
- Maritime ICT & Mobility Research Department, Korea Institute of Ocean Science and Technology, 385 Haeyang-Ro, Yeongdo-Gu, Busan, 49111, Republic of Korea.
| |
Collapse
|