符合效率示踪法测量<sup>99</sup>Tc活度

符合效率示踪法测量⁹⁹Tc活度

摘要: 利用⁶⁰Co作为示踪核素，采用4πβ-γ符合法绝对测量了示踪核素⁶⁰Co溶液和⁶⁰Co+⁹⁹Tc混合溶液的比活度，采用效率示踪法计算得到被示踪核素⁹⁹Tc溶液的比活度，最终标定⁹⁹Tc溶液的比活度为(70.8±1.8)Bq•mg^-1（k=2），满足计量保障要求。

Abstract: The specific activity of ⁶⁰Co radioactive solution and ⁶⁰Co+ ⁹⁹Tc mixing solution was absolutely measured by coincidence method. The specific activity of ⁹⁹Tc solution was calculated by efficiency tracing method with ⁶⁰Co as tracer isotope. Final result is that the specific activity of ⁹⁹Tc solution is (70.8±1.8) Bq•mg^-1（k=2）, which can meet the need of measurement task.