Abstract
Exploration and exploitation of radioactive ores (ilmenite, zircon and monazite) are considered as the main source of exposure to ionizing radiation of the population living in the coast of Analanjorofo Region (Fenerive-Est Districts, Rural municipality Ampasimbe Manantsatrana). Radioactivity measurements have been performed in this region. The distribution of natural radionuclide gamma-emitters (238U, 232Th and 40K) and their respective annual effective dose rates have been determined for sand(s), water and air. The samples have been collected along and around the coast of the region. The radiation emitted from the natural radionuclide containing in the environmental samples has been determined by gamma spectrometry system and Radon meter (SARAD). Exposure dose rates at 1 m above the ground have been measured along the coast and in the villages around the exploitation sites. Dose rate measurements have been performed by Dosimeter Graetz X5 DE, equipped of Geiger Muller Counter. Results have been compared with the reference values provided by IAEA (BSS 115) and UNSCEAR 2000.
Highlights
Natural radioactivity represents the main source of human exposure to ionizing radiation
The objective of this study is to evaluate the natural levels of radioactivity from radioactive ores in the study areas and surrounding villages; to quantify the impact of activities related to the exploitation of radioactive ores; to ensure the radiological protection of workers in the site, handling radioactive substances, and publics living around the sites
The annual effective dose rates and external hazard indexes have been evaluated and compared to the limits proposed by United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR, 2000) and the measurements of dose rate have been carried out using GRAETZ X5 DE Ratemeter equipped with Geiger Muller detector
Summary
Natural radioactivity represents the main source of human exposure to ionizing radiation. It represents a significant asset to the assessment of the radiation hazards associated with the exploitation of radioactive ores. The assessment of gamma radiation dose from radioactive ores presents a particular importance to study the contribution of external and internal doses for public around the sites and workers in the sites. The objective of this study is to evaluate the natural levels of radioactivity from radioactive ores in the study areas and surrounding villages; to quantify the impact of activities related to the exploitation of radioactive ores; to ensure the radiological protection of workers in the site, handling radioactive substances, and publics living around the sites. Laboratory measurements are performed by gamma spectrometry system using NaI(Tl) detector in order to determine the natural radionuclide activities in soil, sand and water samples. The annual effective dose rates and external hazard indexes have been evaluated and compared to the limits proposed by United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR, 2000) and the measurements of dose rate have been carried out using GRAETZ X5 DE Ratemeter equipped with Geiger Muller detector
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