Analysis of Terrestrial Nuclear Radiation Dose Rate Distribution in Kotamobagu City Asri Arbie (a), Adinda Putri Balqis Mokodongan (b)*, Muzdalifa A. Madusila (c), Syafril Agustion Tomayahu (d), Melki Hasan (e), and Anggraini Daud (f)
Department of Physics, Universitas Negeri Gorontalo, Gorontalo, Indonesia
Abstract
This study analyzes the spatial distribution of terrestrial nuclear radiation dose rates in Kotamobagu City. Direct measurements were conducted at 100 points using a 500 m x 500 m grid method with a Pocket Geiger Type 6 (POKEGA) device. The detector was placed about 1 meter above the ground surface and controlled through via the POKEGA application, which automatically recorded data at two-minute intervals. The measurement data were stored in CSV and KML formats and then processed through classification, visualization, and spatial mapping to determine the distribution pattern of environmental radiation. The results indicate that radiation dose rates vary across locations, yielding a maximum value of 0.3767 mSv/y, a minimum of 0.254 mSv/y, and an average of 0,2628 mSv/y. The radiation dose rates in ranged from 0.0876 to 0.876 mSv/y in residential areas, 0.0876 to 0.438 mSv/y in vegetation zones, 0.0876 to 0.5256 mSv/y rice fields, 0.2628 to 0.3504 mSv/y in open fields, and 0.438 to 0.5256 mSv/y in the city center. These discrepancies demonstrate that dose rates fluctuate based on localized activities. Additionally, result confirm that terrestrial radiation throughout Kotamobagu City does not exceed the environmental safety threshold of 1 mSv/y.
