Figure 1. Mean activity concentration for 40K, 238U and 232Th in top soil samples

From

Measurement of Surface Dose Rate of Nuclear Radiation in Coastal Areas of Akwa Ibom State, Nigeria

Essiett A. A., Essien I. E., Bede M. C.

International Journal of Physics. 2015, 3(5), 224-229 doi:10.12691/ijp-3-5-5