【摘要】 随着技术的不断改进,中国原子能科学研究院在前期研制的低能量AMS装置的基础上,又研制了紧凑型AMS装置。本工作就是基于新建立的紧凑型AMS装置,开展²³⁹Pu的测量技术研究。为了实现²³⁹Pu的AMS系统传输,利用²³⁸U系统性研究了剥离气体种类、剥离价态选择、剥离气体厚度、预加速电压与传输效率的关系,建立了紧凑型加速器质谱装置的²³⁹Pu最佳传输条件;通过系列标准样品和空白样品的测定,验证了装置测量线性R²=0.999 7,得到了紧凑型加速器质谱对²³⁹Pu的探测限为0.1 fg。为开展²³⁹Pu在环境、地质等方面的广泛应用奠定了基础。更多还原

【Abstract】 With the technology improvement,a compact Accelerator Mass Spectrometry（AMS） device has been developed by China Institute of Atomic Energy on the basis of the low-energy AMS device developed earlier.The measurement method of ²³⁹Pu was investigated with newly established compact AMS device.In order to establish the ²³⁹Pu transport with the AMS system,the relationships of the transmission efficiency with the type of stripping gas,the selection of charge states,the thickness of stripping gas and the pre-acceleration voltage were systematically studied by using ²³⁸U,and then the optimized conditions of ²³⁹Pu measurement with the AMS system is established.It is verified that the linear R² of the device is 0.999 7 and the detection limit of ²³⁹Pu is 0.1 fg through a series of standard samples and blank samples.It lays a foundation for the wide application of ²³⁹Pu in environmental and geological fields.更多还原