【摘要】 用Fe(OH) 3共沉淀从天然水中提取纯化SiO2 ,回收率在 30 %～ 98% ,然后提取32 P ,将H3PO4溶液和PicoflourLLT混合制备计数溶液 ,用液体闪烁计数法测量32 P的放射性 ,计算32 Si的放射性浓度 ,最后确定地下水的年龄。通过对河北平原浅层地下水的32 Si年龄进行测定 ,所得的32 Si年龄为 92 9 89a± 1 7 87a,与1 4 C的校正年龄一致更多还原

【Abstract】 SiO 2 in natural water is obtained by co-precipitation with Fe(OH) 3 with total yields of 30%～98%. Then 32 P is extracted and purified. The counting solution is prepared by mixing H 3PO 4 solution with Pico-flour LLT and radioactivity of 32 P is measured by liquid scintillation counting method. The radioactivity of 32 Si from the samples is then calculated. The method has been applied to dating of shallow groundwater in Hebei plain. The results are 929.89 a±17.87 a and in agreement with those obtained by 14 C method.更多还原