The research on pre-processing method of uranium bearing sandstone specimen and simultaneously detecting of uranium and thorium

A pre-processing method was researched for uranium bearing sandstone specimen.Specimen was resolved with sodium peroxide and anglomercted with CTMAB,so as to eliminate the effection of silica acid gel to the separation and concentration of uranium and thorium connected with polaragraphic,the uranium and thorium can be determined simultaneously.Linearity for uranium and thorium were found in ranges of 0.001～0.500 μg/10mL with their detection limits of 8.63×10-6 μg/mL and 5.16×10-6 μg/mL.This method has been used in the continuous determination of uranium and thorium with the content less than 5×10-6 in sandstones-type uranium deposit and satisfactory results has been gotten.