Radiation Monitoring Technical Center

Hangzhou, China

Radiation Monitoring Technical Center

Hangzhou, China
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Ma G.,Zhejiang University | Liu G.,Radiation Monitoring Technical Center | Shen S.,Zhejiang University | Chai Y.,Zhejiang University | And 3 more authors.
Journal of Mass Spectrometry | Year: 2017

Collision-induced dissociation of protonated N,N-dibenzylaniline was investigated by electrospray tandem mass spectrometry. Various fragmentation pathways were dominated by benzyl cation and proton transfer. Benzyl cation transfers from the initial site (nitrogen) to benzylic phenyl or aniline phenyl ring. The benzyl cations transfer to the two different sites, and both result in the benzene loss combined with 1,3-H shift. In addition, after the benzyl cation transfers to the benzylic phenyl ring, 1,2-H shift and 1,4-H shift proceed competitively to trigger the diphenylmethane loss and aniline loss, respectively. Deuterium labeling experiments, substituent labeling experiments and density functional theory calculations were performed to support the proposed benzyl cation and proton transfer mechanism. Overall, this study enriches the knowledge of fragmentation mechanisms of protonated N-benzyl compounds. Copyright © 2017 John Wiley & Sons, Ltd. Copyright © 2017 John Wiley & Sons, Ltd.

Hu Q.-H.,Beijing Normal University | Hu Q.-H.,University of Texas at Arlington | Weng J.-Q.,Radiation Monitoring Technical Center | Wang J.-S.,Beijing Normal University
Journal of Environmental Radioactivity | Year: 2010

Studies of radionuclides in the environment have entered a new era with the renaissance of nuclear energy and associated fuel reprocessing, geological disposal of high-level nuclear wastes, and concerns about national security with respect to nuclear non-proliferation. This work presents an overview on sources of anthropogenic radionuclides in the environment, as well as a brief discussion of salient geochemical behavior of important radionuclides. We first discuss the following major anthropogenic sources and current developments that have lead, or could potentially contribute, to the radionuclide contamination of the environment: (1) nuclear weapons program; (2) nuclear weapons testing; (3) nuclear power plants; (4) uranium mining and milling; (5) commercial fuel reprocessing; (6) geological repository of high-level nuclear wastes that include radionuclides might be released in the future, and (7) nuclear accidents. Then, we briefly summarize the inventory of radionuclides 99Tc and 129I, as well as geochemical behavior for radionuclides 99Tc, 129I, and 237Np, because of their complex geochemical behavior, long half-lives, and presumably high mobility in the environment; biogeochemical cycling and environment risk assessment must take into account speciation of these redox-sensitive radionuclides. © 2008 Elsevier Ltd.

Xue H.,Radiation Monitoring Technical Center | Xue H.,State Key Laboratory of Radiation Environmental Monitoring | Yang W.-G.,Radiation Monitoring Technical Center | Yang W.-G.,State Key Laboratory of Radiation Environmental Monitoring | And 6 more authors.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2014

Radiation detectors are widely used in homeland security, nuclear emergency, environmental monitoring and other fields, as a significant tool for prevention of nuclear proliferation, reducing the threat of nuclear terrorism and protection of national security. In this paper, the performance testing and evaluation system of radiation detectors by the U.S. Department of Homeland Security (DHS) is introduced. The National Nuclear Detection Office (DNDO) established Rad/Nuc Detector Evaluation and Reporting (GRaDER) Program to evaluate commercial Rad/Nuc detection equipment against ANSI / IEEE N42 consensus standards adopted by the Department of Homeland Security, using National Voluntary Laboratory Accreditation Program (NVLAP) lab accreditation process to confirm test lab capability and competence. These can be significantly used for reference for the similar work in China. ©, 2014, Atomic Energy Press. All right reserved.

Zhang Y.,Radiation Monitoring Technical Center | Zhang Y.,Fudan University | Yang W.-G.,Radiation Monitoring Technical Center | Chen X.-J.,Radiation Monitoring Technical Center | Huang G.-F.,Radiation Monitoring Technical Center
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2013

It reports the determination of the response of some instruments to cosmic ray on the surface of six lakes. The results show that the response of different types of instruments varies substantially, the values measured by high pressure ionic chamber (HPIC) are higher than those measured by scintillators. It is important to determination the response of the instrument to cosmic ray on the surface of big lake whose geomagnetic latitude and altitude are adjacent to measurement point, to uniform the measurements of national radiation environmental monitoring network.

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