Abstract
Measurements of
222
Rn,
226
Ra and
228
Ra concentration in a total of 19 different well waters sampled collected from Al-Jawa, Saudi Arabia were investigated. The concentrations of
222
Rn were measured by RAD7 H
2
O technique. The concentration of
226
Ra and
228
Ra were measured using gamma spectrometry preceded by ion exchange chromatography separation. It was found that the concentration of
222
Rn ranged from 1.45 ± 1.19 to 9.15 ± 1.55 Bq L
−1
. These values are below 11 Bq L
−1
the maximum contamination level recommended from the U.S. Environmental Protection Agency. The range of
226
Ra concentration are 0.012 ± 0.001 to 0.59 ± 0.049 Bq L
−1
with average value 0.29 ± 0.025 Bq L
−1
. The range of
228
Ra concentration are 0.062 ± 0.007 to 2.12 ± 0.08 Bq L
−1
with average value 0.86 ± 0.029 Bq L
−1
.