1
|
Li Y, Li T, Wang Y, Hong B, Wang F. Determination method of high fluence rate for D-T neutron source with long counter. RADIAT MEAS 2021. [DOI: 10.1016/j.radmeas.2021.106662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
2
|
|
3
|
Kowatari M, Nishino S, Romallosa KMD, Yoshitomi H, Tanimura Y, Ohishi T. EXPERIMENTAL DETERMINATION OF ANISOTROPIC EMISSION OF NEUTRONS FROM 252CF NEUTRON SOURCE WITH THE SPHERICAL PROTECTION CASE. RADIATION PROTECTION DOSIMETRY 2020; 189:436-443. [PMID: 32390037 DOI: 10.1093/rpd/ncaa064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 04/07/2020] [Accepted: 04/20/2020] [Indexed: 06/11/2023]
Abstract
The anisotropic emission of neutrons from a cylindrical X1 252Cf source with the spherical external casing was experimentally determined. The influence of metal materials and shapes of the external casing to the anisotropy factor, FI(θ), was assessed by the Monte Carlo calculation, before performing the measurement. The results of the calculation implied that light- and spherical-shaped external casing decreases the anisotropic emission of neutrons from a cylindrical source and the nature of the material does not affect the anisotropic emission to a large extent. The experimental results obtained when a spherical-shaped aluminum protection case was employed also revealed that the anisotropy factor was close to 1.0 with a wide zenith angle range. Considering the source handling and measures against mechanical impact to the source, we designed an SUS304-made spherical protection case for a renovated source delivering apparatus. With the SUS304-made spherical protection case, the measured anisotropy factor FI(90) was determined to be 1.002 ± 0.002 (k = 1). Results from the experiments also indicated that the measured anisotropy factor has a flat distribution from 55 to 125° with zenith angle.
Collapse
Affiliation(s)
- Munehiko Kowatari
- Japan Atomic Energy Agency, 2-4, Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage, Chiba 263-0024, Japan
| | - Sho Nishino
- Japan Atomic Energy Agency, 2-4, Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
| | - Kristine Marie D Romallosa
- Department of Science and Technology, Philippine Nuclear Research Institute (PNRI), Diliman, Quezon City, Manila 1101, Philippines
| | - Hiroshi Yoshitomi
- Japan Atomic Energy Agency, 2-4, Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
| | - Yoshihiko Tanimura
- Japan Atomic Energy Agency, 2-4, Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
| | - Tetsuya Ohishi
- Japan Atomic Energy Agency, 2-4, Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
| |
Collapse
|
4
|
Park RJ, Byun SH. Optimization of a Neutron Long Counter Design by Monte Carlo Simulation. HEALTH PHYSICS 2019; 117:300-305. [PMID: 31349356 DOI: 10.1097/hp.0000000000001111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In a search to optimize neutron long counter design for overall efficiency and flat energy response, Monte Carlo simulations were carried out for a variety of detector design parameters using the Monte Carlo N-Particle Extended code. Based on the standard long counter design by McTaggart, moderator diameter, moderator back length, and longitudinal hole diameter were sequentially varied, and the sensitivity of each parameter to the long counter response was systematically analyzed. For each design, simulations were done in the neutron energy range of 1 keV to 10 MeV. From the simulation results, it turned out that out of the three moderator parameters, the moderator diameter is most sensitive for optimizing the long counter response. As the last design parameter, the effect of the central slow-neutron counter was investigated, which showed a significant difference in the response. The investigation of each design parameter gave clear insight on its effect on the long counter response and enabled one to determine the optimum condition.
Collapse
Affiliation(s)
- R J Park
- Radiation Sciences Graduate Program, McMaster University
| | - S H Byun
- Radiation Sciences Graduate Program, McMaster University
- Department of Physics and Astronomy, McMaster University
| |
Collapse
|
5
|
Hu Z, Peng X, Chen Z, Du T, Ge L, Yuan X, Cui Z, Zhu W, Wang Z, Zhu X, Chen J, Li X, Zhang G, Chen J, Zhang H, Gorini G, Fan T. Experimental characterization of a long counter for neutron fluence measurement. RADIAT MEAS 2018. [DOI: 10.1016/j.radmeas.2018.08.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
6
|
Mazunga M, Li T, Li Y, Hong B, Wang Y, Ji X. Design of an Extended Range Long Counter Using Super Monte Carlo Simulation. RADIATION PROTECTION DOSIMETRY 2017; 175:413-417. [PMID: 27986961 DOI: 10.1093/rpd/ncw368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Accepted: 11/30/2016] [Indexed: 06/06/2023]
Abstract
We have designed an extended range neutron long counter on the basis of work optimized using SuperMC code. The problem of the existing traditional long counters is that their response function falls rapidly above 5 MeV. We proposed a new designed by adding two layers of converter material inside the polyethylene moderator. The relatively low density chromium and high density lead metals convert high energy neutron by (n, xn) spallation reaction. This produces more neutrons of lower energies, which have higher probability of being detected by thermal 3He-counter. The response function at lower neutron energies was improved by inserting small polyethylene cylinder in front of 3He counter. In this design we achieved to extent the flat response function of the long counter from few keV up to 150 MeV. The total fluctuation of response curve is less than ±9% over the entire energy range. The designed long counter is suitable to be used as neutron monitor for monitoring neutron fluence at high-energy neutron source.
Collapse
Affiliation(s)
- Mohamed Mazunga
- University of Science and Technology of China, Hefei, Anhui 230027, China
- Key Laboratory of Neutronics and Radiation Safety, Chinese Academy of Sciences, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Taosheng Li
- Key Laboratory of Neutronics and Radiation Safety, Chinese Academy of Sciences, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui230031, China
| | - Yanan Li
- Key Laboratory of Neutronics and Radiation Safety, Chinese Academy of Sciences, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui230031, China
| | - Bing Hong
- Key Laboratory of Neutronics and Radiation Safety, Chinese Academy of Sciences, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui230031, China
| | - Yongfeng Wang
- Key Laboratory of Neutronics and Radiation Safety, Chinese Academy of Sciences, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui230031, China
| | - Xiang Ji
- Key Laboratory of Neutronics and Radiation Safety, Chinese Academy of Sciences, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui230031, China
| |
Collapse
|
7
|
Nikezic D, Shahmohammadi Beni M, Krstic D, Yu KN. Characteristics of Protons Exiting from a Polyethylene Converter Irradiated by Neutrons with Energies between 1 keV and 10 MeV. PLoS One 2016; 11:e0157627. [PMID: 27362656 PMCID: PMC4928842 DOI: 10.1371/journal.pone.0157627] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 06/02/2016] [Indexed: 11/18/2022] Open
Abstract
Monte Carlo method has been used to determine the efficiency for proton production and to study the energy and angular distributions of the generated protons. The ENDF library of cross sections is used to simulate the interactions between the neutrons and the atoms in a polyethylene (PE) layer, while the ranges of protons with different energies in PE are determined using the Stopping and Range of Ions in Matter (SRIM) computer code. The efficiency of proton production increases with the PE layer thickness. However the proton escaping from a certain polyethylene volume is highly dependent on the neutron energy and target thickness, except for a very thin PE layer. The energy and angular distributions of protons are also estimated in the present paper, showing that, for the range of energy and thickness considered, the proton flux escaping is dependent on the PE layer thickness, with the presence of an optimal thickness for a fixed primary neutron energy.
Collapse
Affiliation(s)
- D. Nikezic
- Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, China
- Faculty of Science, University of Kragujevac, Kragujevac, Serbia
| | | | - D. Krstic
- Faculty of Science, University of Kragujevac, Kragujevac, Serbia
| | - K. N. Yu
- Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, China
- * E-mail:
| |
Collapse
|