Development of a diverging collimator for environmental radiation monitoring in the industrial fields

• Published in: Nuclear Engineering and Technology
• Main Authors: Dong-Hee Han, Seung-Jae Lee, Jang-Oh Kim, Da-Eun Kwon, Hak-Jae Lee, Cheol-Ha Baek
• Format: Article
• Language: English
• Published: Elsevier 2022-12-01
• Subjects: Industrial fields; Radiation monitoring; Diverging collimator; Monte Carlo simulation; Location of sources
• Online Access: http://www.sciencedirect.com/science/article/pii/S1738573322003679

Environmental radiation monitoring is required to protect from the effects of radiation in industrial fields such as nuclear power plant (NPP) monitoring, and various gamma camera systems are being developed. The purpose of this study is to optimize parameters of a diverging collimator composed of pure tungsten for compactness and lightness through Monte Carlo simulation. We conducted the performance evaluation based on spatial resolution and signal-to-noise ratio for point source and obtained gamma images and profiles. As a result, optimization was determined at a collimator height of 60.0 mm, a hole size of 1.5 mm, and a septal thickness of 1.0 mm. Also, the full-width-at-half-maximum was 3.5 mm and the signal-to-noise ratio was 53.5. This study proposes a compact 45° diverging collimator structure that can quickly and accurately identify the location of the source for radiation monitoring.