Estimation of Radon Concentration around Public Spaces and Residential Homes with Altitude within Cities of Delta State, Nigeria

This study evaluates the radon concentrations in public places and private residences with different altitudes in selected locations in Delta State. These measurements were carried out using a professional radon monitoring instrument (Alpha GUARD PQ2000 PRO) and a geographical positioning system (GPS-Garmin GPS Map 76S). The recorded mean radon concentration varied from 11.70 ± 5.20 Bq/m3 to 23.90 ±16.60 Bq/m3, which is within the WHO acceptable range (100 Bq/m3). The basement had greater radon concentrations than the upper floors in most situations, although there were few exceptions. The average values of the estimated radiation risk parameters, which include equilibrium equivalent radon concentration, the potential alpha energy concentration, radon exhalation rates, and excess lifetime cancer risk due to exposure to radon radiation from their progeny are 4.7 Bq/m3 to 9.5Bq/m3, 1.20 × 10-3mWL to 2.60 × 10-3mWL, 0.04 × 10-3WML/y to 0.09× 10-3 WML/y, 3.7Bq/m2/h to 7.52Bq/m2/h  and 2.10 × 10-3 to 3.30 × 10-3 respectively. The calculated radiation risk factors were all found to be within the recommended limits based on the data obtained. The research region is deemed safe and poses no threat to people.