Radium equivalent activity concentrations in concrete building blocks in eight cities in Southwestern Nigeria

Radioactivity concentrations and dose assessment for bitumen and soil samples around a bituminous deposit in Ondo State, Nigeria

“…The thorium content was from the 2.610 MeV photopeak from 208 Tl and the potassium content was from the 1.465 MeV photopeak following the decay of 40 K. Each sample was counted for 10 h and the net count, A, under each photopeak was related to the detection efficiency, E p , to obtain the activity concentrations of the radionuclides (Farai and Ademola, 2005)…”

Measurement of natural radionuclides and dose assessment of granites from Ondo State, Nigeria

“…The containers containing the samples were placed directly on the top of the detector and counted for a period of 36 000 seconds. The net area under the photopeak was related to the detection efficiency E p through equation (1) (Farai and Ademola, 2005) ( 1) where t is the counting time, c is the activity concentration in Bq.kg -1 , y is the gamma yield and m is the mass of the sample. The radium content of the samples was determined from the intensity of the 1.765 MeV photopeak of 214 Bi.…”

Current radiological situation in Slavonski Brod, Croatia: is there a reason for concern?

“…Radiological risk is considered to be low if Ra eq <370 Bq kg -1 and H ex <1 (20,21). Table 2 clearly shows that the Ra eq and H ex of our four soil samples are well below these limits.…”