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	Explosives detection using photoneutrons produced by X-rays
	Yang, Yigang ; Li, Yuanjing ; Wang, Haidong ; Li, Tiezhu ; Wu, Bin
	2010-05-10 ; 2010-05-10
会议名称	NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT ; 11th Symposium on Rediation Measurements and Applications ; Ann Arbor, MI ; Web of Science
关键词	explosives detection photoneutron Instruments & Instrumentation Nuclear Science & Technology Physics, Particles & Fields Spectroscopy
中文摘要	The detection of explosives has become a critical issue after recent terrorist attacks. This paper describes research on explosives detection using photoneutrons from a photoneutron convertor that consists of 20 kg heavy water in an aluminum container whose shape was optimized to most effectively convert X-rays to photoneutrons. The X-rays were produced by a 9 MeV electron accelerator with an average electron current of 100 mu A, resulted in a photoneutron yield of > 10(11) n/s. Monte-Carlo simulations show that the radiation field is composed of X-ray pulses, fast neutron pulses and thermal neutrons. Both the X-ray and fast neutron pulses are 5 mu s wide with a 300 Hz repetition frequency. The thermal neutron flux, which is higher than 104 n/cm(2)/S, is essentially time invariant. A time shielding circuit was developed for the spectrometry system to halt the sampling process during the intense X-ray pulses. Paraffin, boron carbide and lead were used to protect the detector from interference from the X-rays, fast neutrons, thermal neutrons and background gamma-rays coming from the system materials induced by photoneutrons. 5" x 5" NaI (TI) scintillators were chosen as the detectors to detect the photoneutrons induced gamma-rays from the inspected explosive simulant. Nitrogen (6.01 cps) 10.828 MeV gamma-rays were detected with one detector from a 50 kg carbamide block placed 60 cm in front of the detector. A collimator was used to reduce the number of background 10.828 MeV gamma-rays coming from the nitrogen in the air to improve the signal to background ratio from 0.136 to 1.81. A detector array of seven 5" x 5" NaI (TI) detectors was used to measure the 2-D distributions of N and H in the sample. The combination of photoneutron analysis and X-ray imaging shows promise for enhancing explosives detection capabilities. (c) 2007 Elsevier B.V. All rights reserved.; Univ Michigan
会议录出版者	ELSEVIER SCIENCE BV ; AMSTERDAM ; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/18668]
专题	清华大学
推荐引用方式 GB/T 7714	Yang, Yigang,Li, Yuanjing,Wang, Haidong,et al. Explosives detection using photoneutrons produced by X-rays[C]. 见:NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 11th Symposium on Rediation Measurements and Applications, Ann Arbor, MI, Web of Science.

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