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Chinese Physics C> 2011, Vol. 35> Issue(7) : 668-674 DOI: 10.1088/1674-1137/35/7/012

Neutron beam monitor based on a boron-coated GEM

  • A new thermal neutron beam monitor with a Gas Electron Multiplier (GEM) is developed to meet the needs of the next generation of neutron facilities. A prototype chamber has been constructed with two 100 mm×100 mm GEM foils. Enriched boron-10 is coated on one surface of the aluminum cathode plate as the neutron convertor. 96 channel pads with an area of 8 mm×8 mm each are used for fast signal readout. In order to study the basic characteristics of a boron-coated GEM, several irradiation tests were carried out with α source 239Pu and neutron source 241Am(Be). The signal induced by the neutron source has a high signal-to-noise ratio. A clear image obtained from α source 239Pu is presented, which shows that the neutron beam monitor based on a boron-coated GEM has a good two-dimensional imaging ability.
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    [1] Carel W.E. Nucl. Instrum. Methods A, 2002, 474: 3832 Gebauer B. Nucl. Instrum. Methods A, 2004, 535: 653 CHEN He-Sheng et al. The Feasibility of CSNS Construction. Beijing: IHEP, 2009.3 (in Chinese)4 Ohshita H et al. Nucl. Instrum. Methods A, 2010, 623: 1265 Andriamonje S et al. A New Detector for Neutron Beam Monitoring. Switzerland: CERN, 20096 Andrew Stephan et al. Radiat Prot Dosimetry, 2005, 115: 3577 Bateman J.E et al. Nucl. Instrum. Methods A, 2002, 477: 3658 Sauli F. Nucl. Instrum. Methods A, 1997, 386: 5319 Oed A. Nucl. Instrum. Methods A, 2004, 525: 6210 Alimov S S et al. IEEE Nuclear Sience Symposium Confer- ence Record, 200811 DONG Jing et al. Chinese Phys. B, 2009, 18: 4229 (in Chinese)

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ZHOU Jian-Rong, SUN Zhi-Jia, LIU Ben, WANG Yan-Feng, YANG Gui-An, ZHOU Liang, XU Hong, DONG Jing, YANG Lei and LI Yi. Neutron beam monitor based on a boron-coated GEM[J]. Chinese Physics C, 2011, 35(7): 668-674. doi: 10.1088/1674-1137/35/7/012
ZHOU Jian-Rong, SUN Zhi-Jia, LIU Ben, WANG Yan-Feng, YANG Gui-An, ZHOU Liang, XU Hong, DONG Jing, YANG Lei and LI Yi. Neutron beam monitor based on a boron-coated GEM[J]. Chinese Physics C, 2011, 35(7): 668-674.  doi: 10.1088/1674-1137/35/7/012 shu
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Received: 2010-09-15
Revised: 2011-01-26
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Neutron beam monitor based on a boron-coated GEM

  • Received Date: 2010-09-15
  • Accepted Date: 2011-01-26
  • Available Online: 2011-07-05

Abstract: A new thermal neutron beam monitor with a Gas Electron Multiplier (GEM) is developed to meet the needs of the next generation of neutron facilities. A prototype chamber has been constructed with two 100 mm×100 mm GEM foils. Enriched boron-10 is coated on one surface of the aluminum cathode plate as the neutron convertor. 96 channel pads with an area of 8 mm×8 mm each are used for fast signal readout. In order to study the basic characteristics of a boron-coated GEM, several irradiation tests were carried out with α source 239Pu and neutron source 241Am(Be). The signal induced by the neutron source has a high signal-to-noise ratio. A clear image obtained from α source 239Pu is presented, which shows that the neutron beam monitor based on a boron-coated GEM has a good two-dimensional imaging ability.

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