Neutron-detection efficiency of hybrid resistive plate chambers as estimated by using the MC50 cyclotron at KIRAMS

Byungsik Hong, R. J. Hu, M. Ito, T. I. Kang, B. I. Kim, H. C. Kim, J. H. Kim, K. B. Lee, K. S. Lee, Sung Keun Park, M. S. Ryu, K. S. Sim

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Abstract

We present the neutron-detection efficiencies of a Gd-coated single-gap resistive plate chamber (RFC) and a LiF-coated double-gap RPC. The experiments were performed by using indirect neutrons provided by the MC50 cyclotron at the Korea Institute of Radiological and Medical Science. Both RPCs show a decrease in the efficiency with increasing beam current, especially the Gd-coated RPC at the highest beam current (50 nA) that we received. Such a decrease in the efficiency could be understood in terms of a decrease in the effective electric field in the gas gap under high-particle-rate environment. The operational plateaus start at about 8 kV for the Gd-coated RPC and at about 6.7 kV for the LiF-coated RPC. The neutron-detection efficiencies of the Gd-coated and the LiF-coated RPCs are about 2.5 and 1.8 %, respectively, at the operational high-voltage-plateau region. These results are completely consistent with the previous efficiencies obtained by using an intense 252Cf source.

Original languageEnglish
Pages (from-to)1414-1420
Number of pages7
JournalJournal of the Korean Physical Society
Volume49
Issue number4
Publication statusPublished - 2006 Oct 1

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cyclotrons
chambers
neutrons
beam currents
plateaus
medical science
Korea
high voltages
electric fields
gases

Keywords

  • Cyclotron
  • KIRAMS
  • Neutron detection efficiency
  • Resistive plate chamber

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Neutron-detection efficiency of hybrid resistive plate chambers as estimated by using the MC50 cyclotron at KIRAMS. / Hong, Byungsik; Hu, R. J.; Ito, M.; Kang, T. I.; Kim, B. I.; Kim, H. C.; Kim, J. H.; Lee, K. B.; Lee, K. S.; Park, Sung Keun; Ryu, M. S.; Sim, K. S.

In: Journal of the Korean Physical Society, Vol. 49, No. 4, 01.10.2006, p. 1414-1420.

Research output: Contribution to journalArticle

Hong, B, Hu, RJ, Ito, M, Kang, TI, Kim, BI, Kim, HC, Kim, JH, Lee, KB, Lee, KS, Park, SK, Ryu, MS & Sim, KS 2006, 'Neutron-detection efficiency of hybrid resistive plate chambers as estimated by using the MC50 cyclotron at KIRAMS', Journal of the Korean Physical Society, vol. 49, no. 4, pp. 1414-1420.
Hong, Byungsik ; Hu, R. J. ; Ito, M. ; Kang, T. I. ; Kim, B. I. ; Kim, H. C. ; Kim, J. H. ; Lee, K. B. ; Lee, K. S. ; Park, Sung Keun ; Ryu, M. S. ; Sim, K. S. / Neutron-detection efficiency of hybrid resistive plate chambers as estimated by using the MC50 cyclotron at KIRAMS. In: Journal of the Korean Physical Society. 2006 ; Vol. 49, No. 4. pp. 1414-1420.
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abstract = "We present the neutron-detection efficiencies of a Gd-coated single-gap resistive plate chamber (RFC) and a LiF-coated double-gap RPC. The experiments were performed by using indirect neutrons provided by the MC50 cyclotron at the Korea Institute of Radiological and Medical Science. Both RPCs show a decrease in the efficiency with increasing beam current, especially the Gd-coated RPC at the highest beam current (50 nA) that we received. Such a decrease in the efficiency could be understood in terms of a decrease in the effective electric field in the gas gap under high-particle-rate environment. The operational plateaus start at about 8 kV for the Gd-coated RPC and at about 6.7 kV for the LiF-coated RPC. The neutron-detection efficiencies of the Gd-coated and the LiF-coated RPCs are about 2.5 and 1.8 {\%}, respectively, at the operational high-voltage-plateau region. These results are completely consistent with the previous efficiencies obtained by using an intense 252Cf source.",
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AU - Kim, J. H.

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AB - We present the neutron-detection efficiencies of a Gd-coated single-gap resistive plate chamber (RFC) and a LiF-coated double-gap RPC. The experiments were performed by using indirect neutrons provided by the MC50 cyclotron at the Korea Institute of Radiological and Medical Science. Both RPCs show a decrease in the efficiency with increasing beam current, especially the Gd-coated RPC at the highest beam current (50 nA) that we received. Such a decrease in the efficiency could be understood in terms of a decrease in the effective electric field in the gas gap under high-particle-rate environment. The operational plateaus start at about 8 kV for the Gd-coated RPC and at about 6.7 kV for the LiF-coated RPC. The neutron-detection efficiencies of the Gd-coated and the LiF-coated RPCs are about 2.5 and 1.8 %, respectively, at the operational high-voltage-plateau region. These results are completely consistent with the previous efficiencies obtained by using an intense 252Cf source.

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