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为了提高~(131)I胶囊的产品质量,建立和使用相应的长期有效的模拟~(131)I标准胶囊是十分重要的。为此采用长寿命~(133)Ba和~(137)Cs的混合物来模拟短寿命的~(131)I的γ谱,通过一系列条件试验确定了制备模拟~(131)I标准胶囊的方法和适宜条件。用离子交换方法获得高纯~(133)Ba,~(137)Cs和~(131)I,并将它们分别制备成具有化学和物理稳定性的溶液,以4πβ-γ符合和4π液闪两种方法测定它们的放射性活度。按照预先得到的最佳比例将~(133)Ba和~(137)Cs混合起来,用~(131)I标准溶液刻度其~(131)I当
In order to improve the product quality of ~ (131) I capsule, it is very important to establish and use the corresponding long-term effective analogue (131) I standard capsule. For this purpose, a mixture of long-lived ~ (133) Ba and ~ (137) Cs was used to simulate the γ-spectrum of ~ (131) I with a short lifetime and a series of conditions were used to determine the method of preparing simulated ~ (131) I standard capsules And suitable conditions. High purity 133 Ba, 137 Cs and 131 I were obtained by ion exchange method, and they were respectively prepared into solutions with chemical and physical stability. Using 4πβ-γ coincidence and 4π liquid flash two Methods to determine their radioactivity. The ~ (133) Ba and ~ (137) Cs were mixed according to the optimal ratio obtained in advance, and ~ 131 I was calibrated with ~ (131) I standard solution