1. Agbalagba EO, Meindinyo RK (2010) Radiological impact of oil spilled environment: a case study of the Eriemu well 13 and 19 oil spillage in Ughelli Region of delta state, Nigeria. Indian J Sci Technol 2:1001–1005
2. Agbalagba EO, Awviri GO, Chad-Umoren YE (2009) Occupational radiation profile of oil and gas facilities during production and off- production periods in Ughelli, Nigeria. Facta Univ Work Living Environ Prot 6(1):11–19
3. Akpabio LE, Etuk ES, Essian K (2005) Environmental radioactive levels in Ikot Ekpene Nigeria. Niger J Space Res 1:80–87
4. Al Mugren KS (2015) Assessment of natural radioactivity levels and radiation dose rate in some soil samples from historical area, Al-Rakkah, Saudi Arabia. Nat Sci 7:238–247
5. Amekudzie A, Emi-Reynolds G, Faanu A, Darko EO, Awudu AR, Adukpo O, Quaye LAN, Kpordzro R, Agyemang B, Ibrahim A (2011) Natural radioactivity concentration and dose assessment in shore sediments along the coast of Greater Accra, Ghana. World Appl Sci J 13(11):2338–2343