DETERMINATION OF NATURAL RADIOACTIVITY LEVELS AND RADIOLOGICAL HAZARDS OVER ILESHA AND ENVIRONS USING AIRBORNE RADIOMETRIC DATA

LOJEDE,, DARE SAMSON (2022) DETERMINATION OF NATURAL RADIOACTIVITY LEVELS AND RADIOLOGICAL HAZARDS OVER ILESHA AND ENVIRONS USING AIRBORNE RADIOMETRIC DATA. Masters thesis, Landmark University, Omu Aran, Kwara State.

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Abstract

T The quest to know the health implications of certain ingestible and digestible in the environment on humans is on the increase. Unique and related researches in Ilesha have been carried out except for coverage of health risk to the populace in the neighbouring villages and towns which may be due to security challenges and simile unprecedented exposure of expatriate to excess radiation. This work was to determine rocks’ radioactivity levels, radioactive heat generation rate and surrounding radiation hazards to humans using airborne radiometric data. The mean concentration of the radioelements and activity concentration of Ilesha and environs were 2.66 %, 16 ppm and 13.98 ppm, and 831.35, 56.77 and 56.77 Bq kg−1 for 40K, 232Th and 238 U, respectively. The estimated average radioactive heat production (A) for the studied rocks of 2.03 µWm−3 was above the world crustal mean range with values from 0.8 µWm−3 to 1.20 µWm−3 which may lead to enhanced average temperature of the area studied. The average absorbed dose of 52.60 nGy h−1 is consistent with the world standard range, and other investigated radiological variables, which include the outdoor and indoor effective dose for a year, external and internal hazard indices, gamma representative index and activity utilization index were all found to be below the recommended world minimum of 1.00 mSv y−1 for the rocks. Furthermore, the estimated gonadal effective dose for a year (362.30 µSv y−1) and excessive lifetime cancer risk (9.00 × 10−4) which were above the world permissible limits are indications to the fact that banded gneisis, migmatite, porphyritic granite and quartzite rocks of the studied area with high gamma radiations are not advisable for use in construction works and other applications. Moreover, the regular check on the radiological threat state of the studied area is proposed. Radioactivity Levels, Gamma Radiations, Airborne Radiometric Data, Radiological Hazards, Radioactive Heat

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