加速器质谱测量59Ni的方法研究

Measurements of 59Ni with Accelerator Mass Spectrometry

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。

The long lived radioisotope of 59Ni has wide application in many research fields,such as nuclear physics and astrophysics,the management of radioactive waste,biomedical tracer and so on.In order to carry out the applications based on 59 Ni,the method of the accelerator mass spectrometry （AMS） was developed into the best way to measure 59Ni with high sensitivity,Interfering isobars are the main problem for 59Ni measurement with AMS.Based on the HI-13 tandem accelerator at the China Institute of Atomic Energy,high precision Q3D detection system and chemical separation technology,the interfering isobar of 59Co is greatly eliminated.59Ni-AMS highly sensitive measurement method is established with NiCl2 as the target substance.A series of laboratory standard samples and blank sample were measured to check the performance of 59 Ni measurement.The results show that the 59Co can be excluded clearly,and the measurement sensitivity of about 5×10-13 for 59Ni/Ni is obtained based on the measurement of the blank sample,which can be used in the measurement of actual samples.