干旱区生态环境知识资源中心(Arid): Natural radioactivity assessment and geophysical interpretation of parts of Igarra area, Southern Nigeria

Arid

DOI	10.1007/s10661-022-10055-2
	Natural radioactivity assessment and geophysical interpretation of parts of Igarra area, Southern Nigeria
	Agoha, C. C.; Adejuwon, B. B.; Mgbeojedo, T., I; Onwubuariri, C. N.; Akiang, F. B.; Ibeneme, S. I.; Okechukwu, S., I; Ofoh, I. J.; Njoku, J. O.
通讯作者	Agoha, CC
来源期刊	ENVIRONMENTAL MONITORING AND ASSESSMENT
ISSN	0167-6369
EISSN	1573-2959
出版年	2022
卷号	194 期号:6
英文摘要	To evaluate the concentration of natural radionuclides and to carry out geophysical interpretation of part of Igarra area, Southern Nigeria, an integrated geophysical approach was adopted involving radiometric, gravity, and magnetic methods. The RS-230 Super-Spec spectrometer, G-512 Lacoste and Romberg gravimeter, and the GSM-19v7.0 Overhauser instrument were used for the radiometric, gravity, and magnetic data acquisitions, respectively, along a specified traverse within the area. The datasets were processed using Oasis Montaj, Gray-Master, and Ms-Excel software. Gravity results show that the mean free air and Bouguer anomalies in the area are- 67.42 and -84.22 mGal, while magnetic survey indicates that the mean corrected magnetic field intensity in this area is 32218.49 nT. Radiometric survey results show that the mean radioactivity concentrations of thorium (232(Th)), uranium (238(U)), and potassium (40(K)) are 31.81 Bq/kg, 26.48 Bq/kg, and 167.33 Bq/kg, respectively. Further analysis also revealed that the mean radioactivity equivalent of the area is 84.86 Bq/ kg; absorbed dose rate is 72.74nGy/h, while the mean external hazard index is 0.30. A novel model equation for estimating absorbed dose rate from radioactivity equivalent was also obtained and validated. The gravity and magnetic survey results indicate the presence of low-density and high magnetic basement rocks underlying this area, while radiometric results reveal that radiations in this area did not exceed acceptable standards of 370 Bq/kg for radioactivity equivalent, 84 nGy/h for absorbed dose rate, and unity which corresponds to 370 Bq/kg for external hazard index as recommended by the United Nations Scientific Committee on the Effects of Atomic Radiation and the International Atomic Energy Agency.
英文关键词	Natural radionuclides Gravity Magnetic field intensity Model equation Free air anomaly Bouguer anomaly
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000797778900001
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392476
推荐引用方式 GB/T 7714	Agoha, C. C.,Adejuwon, B. B.,Mgbeojedo, T., I,et al. Natural radioactivity assessment and geophysical interpretation of parts of Igarra area, Southern Nigeria[J],2022,194(6).
APA	Agoha, C. C..,Adejuwon, B. B..,Mgbeojedo, T., I.,Onwubuariri, C. N..,Akiang, F. B..,...&Njoku, J. O..(2022).Natural radioactivity assessment and geophysical interpretation of parts of Igarra area, Southern Nigeria.ENVIRONMENTAL MONITORING AND ASSESSMENT,194(6).
MLA	Agoha, C. C.,et al."Natural radioactivity assessment and geophysical interpretation of parts of Igarra area, Southern Nigeria".ENVIRONMENTAL MONITORING AND ASSESSMENT 194.6(2022).