Developing AMS measurement of ^(59)Ni at CIAE

Abstract： Accelerator mass spectrometry （AMS） measurement of 59Ni has been HI-13 tandem accelerator and the recently developed AE-Q3D detection system established at CIAE with the 59Ni standard and commercial NiO samples were measured to check the performance of the △E-Q3D detection system on 59Ni isobar separation and suppression. An overall suppression factor of about 107 for the interfering isobar 59Co resulting in detection sensitivity as low as 3.8×10-13 atomic ratio （59Ni/Ni） has been obtained. Based on these techniques, the AMS measurement method of 59Ni with high sensitivity is developed.

加速器质谱测量59Ni的方法研究

长寿命放射性核素59 Ni在核物理与天体物理、放射性废物管理、陨石与宇宙射线研究、生物医学示踪等方面有着广泛的应用前景。加速器质谱技术(AMS)是实现59 Ni高灵敏测量的最佳方法,59 Ni-AMS测量的关键问题在于排除同量异位素59 Co的干扰。本工作利用中国原子能科学研究院HI-13大型串列加速器能量高,Q3D磁谱仪能量分辨高、色散大等特点,采用化学分离技术排除59 Co,以氯化镍作为靶物质,建立了59 Ni-AMS的高灵敏测量方法,并对一系列标准样品和空白样品进行测量。结果表明,此方法有效降低了59 Co的干扰,空白样品中59 Ni/Ni的本底水平低于5×10-13,满足实际样品的测量需要。