Experimental study on the measurement of uranium casting enrichment by time-dependent coincidence method

XIE Wen-Xiong; LI Jian-Sheng; GONG Jian; ZHU Jian-Yu; HUANG Po

doi:10.1088/1674-1137/37/10/106202

Chinese Physics C> 2013, Vol. 37> Issue(10) : 106202 DOI: 10.1088/1674-1137/37/10/106202

Experimental study on the measurement of uranium casting enrichment by time-dependent coincidence method

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Abstract：
Based on the time-dependent coincidence method, a preliminary experiment has been performed on uranium metal castings with similar quality (about 8-10 kg) and shape (hemispherical shell) in different enrichments using neutron from Cf fast fission chamber and timing DT accelerator. Groups of related parameters can be obtained by analyzing the features of time-dependent coincidence counts between source-detector and two detectors to characterize the fission signal. These parameters have high sensitivity to the enrichment, the sensitivity coefficient (defined as (ΔR/Δm)/R) can reach 19.3% per kg of ²³⁵U. We can distinguish uranium castings with different enrichments to hold nuclear weapon verification.

References

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Mttingly J K, Valentine T E, Mihalczo J T. NWIS Measurements for Uranium Metal Annular Castings. Oak Ridge Y-12 Plant, 1998.3[2] Valentine T E, Chiang L G, Mihalczo J T. Preliminary Evaluation of NMIS for Interrogation of PU and HEU in AT400-R Containers at MAYAK. ORNL/M-6648 R4, Oak Ridge National Laboratory, 2000.1[3] Nouri, P. Nagel. OECD Nuclear Energy Agency (www.nea.fr/janis)[4] Mihalczo J T, Mattingly J K, Mullens J A, Neal J S. NMIS With Gamma Spectrometry For Attributes of Pu and HEU, Explosives and Chemical Agents. Oak Ridge Y-12 Plant Report, May 10, 2002. Report No:Y/LB-16,123, Rev. 1[5] Mihalczo J T, Mullens J A, Mattingly J K et al. Nuclear Instruments and Methods in Physics Research A, 2000, 450: 531-555[6] LI Jian-Sheng. Nuclear Electronics Detection Technology, 2001, 21(4): 264-267 (in Chinese)[7] Jarrod D Edwards, John K Mattingly, Sara A Pozzi. Analysis of Neutron Reflection in Correlation Measurements. Oak Ridge National Laboratory, 2001[8] Technology RD for Arms Control. Arms Control and Nonproliferation Technologies, NNSA/NN/ACNT-SP01[R]. USA: NNSA, 2001

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XIE Wen-Xiong, LI Jian-Sheng, GONG Jian, ZHU Jian-Yu and HUANG Po. Experimental study on the measurement of uranium casting enrichment by time-dependent coincidence method[J]. Chinese Physics C, 2013, 37(10): 106202. doi: 10.1088/1674-1137/37/10/106202

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Received: 2012-09-14
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Experimental study on the measurement of uranium casting enrichment by time-dependent coincidence method

Corresponding author: XIE Wen-Xiong,

Received Date: 2012-09-14
Accepted Date: 1900-01-01
Available Online: 2013-10-05

Abstract: Based on the time-dependent coincidence method, a preliminary experiment has been performed on uranium metal castings with similar quality (about 8-10 kg) and shape (hemispherical shell) in different enrichments using neutron from Cf fast fission chamber and timing DT accelerator. Groups of related parameters can be obtained by analyzing the features of time-dependent coincidence counts between source-detector and two detectors to characterize the fission signal. These parameters have high sensitivity to the enrichment, the sensitivity coefficient (defined as (ΔR/Δm)/R) can reach 19.3% per kg of ²³⁵U. We can distinguish uranium castings with different enrichments to hold nuclear weapon verification.