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AMS Measurement of 237Np at CIAE

Published online by Cambridge University Press:  09 February 2016

Xianggao Wang
Affiliation:
College of Physical Science and Technology, Guangxi University, Nanning 530004, China China Institute of Atomic Energy, P.O. Box 275(50), Beijing 102413, China
Shan Jiang*
Affiliation:
China Institute of Atomic Energy, P.O. Box 275(50), Beijing 102413, China
Ming He
Affiliation:
China Institute of Atomic Energy, P.O. Box 275(50), Beijing 102413, China
Kejun Dong
Affiliation:
China Institute of Atomic Energy, P.O. Box 275(50), Beijing 102413, China
Hongtao Chen
Affiliation:
China Institute of Atomic Energy, P.O. Box 275(50), Beijing 102413, China
Guozhu He
Affiliation:
China Institute of Atomic Energy, P.O. Box 275(50), Beijing 102413, China
Wei Wang
Affiliation:
China Institute of Atomic Energy, P.O. Box 275(50), Beijing 102413, China
Shaoyong Wu
Affiliation:
China Institute of Atomic Energy, P.O. Box 275(50), Beijing 102413, China
Yuemei Hu
Affiliation:
China Institute of Atomic Energy, P.O. Box 275(50), Beijing 102413, China
*
3Corresponding author. Email: jiangs@ciae.ac.cn.

Abstract

237Np (≃2.14 × 106 yr half-life) is potentially applicable in studies on nuclear safeguards and radioactive waste migration. The atomic ratio of 237Np/U in nature is 10−12 or even lower, depending strongly on the integral neutron flux received by the material. As an ultra-sensitive technique, accelerator mass spectrometry (AMS) is the best for measuring ultratrace 237Np. By extracting negative molecular ions NpO from the oxide sample using 238UO and 208Pb16O2 pilot beams for the simulation of 237Np ion transport, identifying the interference isotopes by high-resolution dedicated injector, electrostatic analyzer, and time of flight (TOF) detector, a method for AMS measurement of 237Np was set up on the HI-13 accelerator at the China Institute of Atomic Energy (CIAE). A sensitivity of <10–11 has been achieved for the isotopic ratio 237Np/238U.

Type
Articles
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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