4πβ-γ coincidence technique is a powerful tool and widely recognised method to determine the absolute activity concentration of radioactive solutions. A new plastic scintillator based coincidence system has been developed and established as a primary standard for radioactivity measurements. The performance of the system was evaluated by the standardisation of ⁶⁰Co radioactive solution due to its simple decay scheme. The activity concentration results obtained by the new system were compared with the existing proportional counter and liquid scintillation based 4πβ-γ coincidence systems. This paper discusses the design details of the new system and its performance evaluation.

4πβ-γ重合技术是确定放射性溶液绝对活度浓度的有力工具和广泛认可的方法。已经开发出一种新的基于塑料闪烁体的符合系统，并将其建立为放射性测量的主要标准。由于其简单的衰变方案，通过对⁶⁰ Co放射性溶液进行标准化来评估系统的性能。将新系统获得的活性浓度结果与现有的比例计数器和基于液体闪烁的4πβ-γ符合系统进行比较。本文讨论了新系统的设计细节及其性能评估。