^(101)Tc半衰期的测量

Measurement of ^(101)Tc Half-Life

在微型中子源反应堆中辐照75 mg仲钼酸铵20 min,冷却12 min,然后用α-安息香肟-乙酸乙酯在水相介质为0.8 mol/L HNO3、相比1∶1条件下,连续萃取2次分离出了无载体、放化纯的101Tc样品。用HPGeγ探测器对306.8 keVγ射线采用位置接续法跟踪测量,分别用"平移法"、"迭代法"和"R-值法"进行数据处理,得到101Tc的半衰期为(14.02±0.01)min(n=5),经检验数据可靠。

75 mg （NH4）6Mo7O24·4H2O solution was irradiated for 20 min in miniature neutron source reactor （MNSR） and cooled for 12 rain. In the conditions of 0.8 mol/L HNOa, phase ratio 1 ： 1, the solution of ^101Tc sample was extracted twice with a-benzoin oxime/ethyl acetate phase to remove ^101Mo and a radiochemically pure and carrier-free ^101Tc product was obtained. The half-life of ^101Tc was accurately measured with a HPGe γ-detector by following 306.8 keV γ-ray about 150 min, and processed the data by three methods, R-value method, iterative method and translation method. Five parallel measurments gave a half-life （14.02 ± 0.01） min （n=5） for ^101Tc.