This is the first detailed study of radioactivity concentrations in
water in Yemen. The natural radioactivity levels of 226Ra, 232Th
and 40 K have beenmeasured inwater samples in Assalamia–Alhomira,
Juban and Dempt areas using gamma ray spectroscopy. The activity
profiles of the radionuclides have clearly showed high activity concentrations
across the study areas. The high activity concentrations
for 226Ra and 232Th measured in water samples explain the relationship
between the groundwater and bedrocks in these areas, for this
reason we suggest that the investigated groundwater are not acceptable
as a drinking water.