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Published: 2017-09-30
Abstract Views: 202
Views PDF: 188
DOI: https://doi.org/10.53747/jnst.v7i3.104
Issue
Vol. 7 No. 3 (2017)
Section
Articles
How to Cite
Chu, V. L., Nguyen, H. Q., Nguyen, N. Q., & Le, N. T. (2017). Calculation of response functions for cylindrical nested neutron spectrometer. Nuclear Science and Technology, 7(3), 52-56. https://doi.org/10.53747/jnst.v7i3.104

Calculation of response functions for cylindrical nested neutron spectrometer

Chu Vu Long1, Nguyen Huu Quyet1, Nguyen Ngoc Quynh1, Le Ngoc Thiem1
1 Institute for Nuclear Science and Technology. 179, Hoang Quoc Viet st., Cau Giay dist., Ha Noi, Vietnam

Main Article Content

Abstract

In a recent work, a new neutron spectrometer, namely Cylindrical Nested Neutron Spectrometer (CNNS). It works under the same principles as a Bonner Sphere Spectrometer (BSS), except that different amounts of moderator around a thermal neutron detector are configured by adding or removing cylindrical shells. The CNNS consists of a 4mm x 4mm 6LiI(Eu) scintillator crystal and nested cylindrical polyethylene moderators. The objective of this paper is describing the use of MCNPX code for determining a optimal ratio between height and diameter of the moderators in order to remain isotropic angular response to neutrons like BSS and determining of response functions for moderators of different diameters at 104 energy points from 0.001 eV to 19.95 MeV.

Article Details

Keywords

cylindrical nested neutron spectrometer, response function, MCNPX code

References

1. ICRP. “Conversion Coefficients for use in Radiological Protection against External Radiation”, ICRP Publication 74. Ann. ICRP 26 (3-4), 1996.
2. Richard L. Bramblett, Ronald I. Ewing, T.W. Bonner. “A new type of neutron spectrometer”, Nuclear Instruments and Methods, 9(1), 1-12, 1960.
3. D.J. Thomas, A.V. Alevra. “Bonner sphere spectrometers – a critical review”, Nuclear Instruments and Methods in Physics Research A, 476, 12-20, 2002.
4. V. Gressier, G.C. Taylor. “Calibration of neutron-sensitive devices”, Metrologia, 48, 2011.
5. IAEA. “Compendium of neutron spectra and detector responses for radiation protection purposes”, Technical reports series No.403, 2001.
6. Vladimir Mares, Hans Schraube. “Evaluation of the response matrix of a Bonner sphere spectrometer with LiI detector from thermal energy to 100 MeV”, Nuclear Instruments and Methods in Physics Research A, 337, 461-473, 1994.
7. MCNPX – A general Monte Carlo N-Particle Transport code – version 2.5.
8. X-5 Monte Carlo Team, “MCNP – A General N-Particle Transport Code, Version 5”, 2003.
9. Thomas E.Booth, “A sample problem for variance reduction in MCNP”, LA-10363-MS, 1985.