Total integrated gamma counts of the spectrum and gamma counts corresp
onding to the peaks 295 keV and 352 keV of Pb-214, 609 keV and 1120 ke
V of Bi-214, 511 keV, 583 keV and 860 keV of Tl-208, 911 keV and 968 k
eV of (228)AC emanating from amang effluent samples were recorded usin
g a GeLi detector. Results have shown the principal source of radioact
ivity to be the Th-232 series. The solubility of thorium oxide in incr
easingly acidic aqueous solutions has been shown to produce elevated l
evels of gamma activity.