Browsing by Author "Babarimisa, I. O."

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Background Gamma Radiation in Grazing Patch Lands and Earthen Fish Ponds in Ota, Nigeria
(ICSSD 2024, 2025) Babarimisa, I. O.; Usikalu, M. R.; Omeje, M.
The pursuit of Sustainable Development Goal 3 (SDG3) concerning sound health and well being is being given much attention in many countries. This study investigates the safety of inhabited environments in relation to background gamma radiation levels linked to naturally occurring radionuclides (NORs). The research focuses on the Iju-Gas-Pipeline area, a significant settlement within the Ado Odo/Ota Local Government Area, comprising both residential and commercial zones. Radioactivity levels were measured in-situ around a grazing land and an earthen fishpond located in the Iju-Gas-Pipeline grassland and valley, respectively. The impact of natural radionuclides on the area was assessed by measuring ambient gamma dose rates and specific activities of radioelements using a mobile RS-125 gamma spectrometer made by Radio Solution Inc. Evaluations of radiological health risk indices were done using the specific activities of the NORs. For the grazing land, background gamma dose rates ranged from 13.94 to 17.92 nGy/h, with an average of 15.40 nGy/h. Specific activities of NORs 40K, 238U, with 232Th varied from 0.0 to 63.20, 22.14 to 34.44, and 1.23 to 6.81 Bq/kg, respectively, yielding average values of 47.40, 27.95, and 4.62 Bq/kg. In contrast, the earthen fishpond exhibited ambient gamma dose rates from 2.54 to 10.80 nGy/h, averaging 7.54 nGy/h, with activity concentrations of 40K, 238U, with 232Th averaging 0.00, 15.17, and 2.34 Bq/kg, respectively. All measured background gamma dose rates and average activity concentrations of NORs were much below their respective threshold limits: 59.00 nGy/h; 420.00, 33.00 and 45.00 Bq/kg. Moreover, the evaluated means of the seven radiological hazard indices considered were significantly lower than their associated permissible levels: 370 Bq/kg, 1, 1, 59.00 and 84.00 nGy/h, 1 and 0.29. Therefore, this study concludes that the Iju-Gas-Pipeline area is radiologically safe.
Environmental assessment of radionuclide exposure in packaged borehole water exploited from crystalline rocks in Ogbomoso
(ICSAEES-2024, Lagos, Nigeria, 2024) Oladipo, A. E.; Aremu, A. A.; Adeniji, A. A.; Ayinla, T. O.; Babarimisa, I. O.; Morakinyo, R. O.; Araka, I. O.; James, U. E.
The amounts of naturally occurring radionuclides (40K, 238U and 232Th) in packaged borehole water manufacture have been investigated in this work. Furthermore, the buildup of radioactive materials in drinking water presents a direct path for human population exposure to internal radiation. The amount of radioactivity in the processed and unprocessed water samples was measured using gamma spectrometry and a computer-resident quantum multichannel analyser (MCA 2100R) connected to a well-calibrated and shielded NaI (Tl) detector. From the results, it was revealed that the values of activity concentration of processed water ranges between 50.46 ± 3.14 Bq/L to 102.18 ± 14.07 Bq/L, 7.92 ± 4.46 to 16.71 Bq/L, and 10.00 ± 0.84 Bq/L to 14.87 ± 4.03 Bq/L for 40K, 238U and 232Th, respectively. Also, the results obtained for the activity concentration of unprocessed water ranges between 74.51 ± 3.51 Bq/L to 102.21 ± 7.23 Bq/L, 14.86 ± 1.91 Bq/L to 19.87 ± 3.10 Bq/L and 10.00 ± 3.36 Bq/L to 17.79 ± 4.43 Bq/L for 40K, 238U and 232Th, respectively. The results confirmed the presence of40K as a principal occurring radionuclide in the water samples. The annual effective dose for processed water ranges from 0.012 to 0.017 mSyr-1, while it ranges between 0.015 and 0.020 mSyr-1 for unprocessed water. Results in the present study fall below 0.1 mSyr-1, which is the acceptable limit recommended by International Commission on Radiological Protection standard value.
Environmental Impact of Pre-occupational radon level measurements in medical imaging facilities of a tertiary hospital in south-west Nigeria
(ICSAEES-2024, Lagos, Nigeria, 2024) Aremu, A. A.; Oni, O. M.; Oladipo, A. E.; Oladapo, O. O.; Obafemi, Y. D.; Oniha, M. I.; Babarimisa, I. O.; James, U. E.
Radiation facilities are placed in an enclosed environment to prevent scattered radiation from getting out of the room, by so doing the rooms foil gas exchange from the outdoor environment, thereby increasing the radon concentration in the indoor air. This study aimed at estimating the occupational radon exposure level in medical facility room in order to estimate the radiological risk in such environment. RAD7 electronic device was used to measure theindoor radon concentration in the five proposed roomsin the newly built Radiology department of a University Teaching Hospital while a digital thermometer was used to measure the ambient temperature. The radon concentrations ranged between 12.09Bq/m3and 58.52 Bq/m3. The ultrasound room has the least average value of 12.09 Bqm-3 and the Fluoroscopy room has the maximum average value of 58.52 Bqm-3. The radon level translated into the effective dose, working level and excess life-time cancer risk for any worker staying for a period of nine hours per day, over a year. Fluoroscopy facility was estimated to present the highest annual absorbed dose and annual effective dose with 0.73 mSvy-1 and 0.8858 mSv y-1, respectively.The mean radon concentration for the five rooms was 41.96Bq/m3. The calculated annual effective dose rate and the mean annual absorbed dose rate to the lung within the radiation facilities rooms were 0.529 mSvy- 1and 0.6350 mSv y-1, respectively.The indoor radon concentrations measured and the effective dose value of 200 Bq/m3 and 1 mSvy-1 respectively is below the reference limitset by International Commission Radiation Protection (ICRP) Agency.This implies that the radiation facility rooms are in conformity with international best practices and this is in agreement with SDG 3 (Good Health and well –being)
Qualitative Analysis of Background Radiation from 238U, 232Th and 40K in Selected Locations in Ekiti State using Aeroradiometry Data
(ICSSD 2024, 2025) Morakinyo, R. O.; Usikalu, M. R.; Adagunodo, T. A.; Ojo, O. F.; Babarimisa, I. O.
Airborne radiometric data collected from Nigeria Geological Survey Agency (NGSA) for selected locations of Ekiti State were analyzed using Oasis Montaj to measure the radionuclides content of the air at 500 m above the ground. The absorbed dose was consequently estimated from the radionuclides content measured in order to determine the possible radiation risk to the dwellers of the locations. The estimated activity concentration of 238U, 232Th and 40K ranges from 0.77-9.50 ppm, 3.49-52.84 ppm and 0.21-4.40% respectively. The radionuclides content was re-construe in Bq/kg using the relevant conversion factors and the values range from 9.49-117.36 Bq/kg, 14.17-214.51 and 65.33-1377.32 for 238U, 232Th and 40K accordingly. The qualitative analysis gave the value of the absorbed dose of 31.92-214.04 nGy/h. The ternary map indicates the relative abundance of 40K in the study area.
Qualitative Analysis of Background Radiation from 238U, 232Th and 40K in Selected Locations in Ekiti State using Aeroradiometry Data
(ICSSD 2024, 2025) Morakinyo, R. O; Usikalu, M. R.; Adagunodo, T. A.; Ojo, O. F.; Babarimisa, I. O.
Airborne radiometric data collected from Nigeria Geological Survey Agency (NGSA) for selected locations of Ekiti State were analyzed using Oasis Montaj to measure the radionuclides content of the air at 500 m above the ground. The absorbed dose was consequently estimated from the radionuclides content measured in order to determine the possible radiation risk to the dwellers of the locations. The estimated activity concentration of 238U, 232Th and 40K ranges from 0.77-9.50 ppm, 3.49-52.84 ppm and 0.21-4.40% respectively. The radionuclides content was re-construe in Bq/kg using the relevant conversion factors and the values range from 9.49-117.36 Bq/kg, 14.17-214.51 and 65.33-1377.32 for 238U, 232Th and 40K accordingly. The qualitative analysis gave the value of the absorbed dose of 31.92-214.04 nGy/h. The ternary map indicates the relative abundance of 40K in the study area.