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Journal Articles

Simulation of the elastic scattering contributions to the NRF-based nondestructive assay of nuclear materials

Omer, M.; Hajima, Ryoichi*; Angell, C.*; Shizuma, Toshiyuki*; Hayakawa, Takehito*; Seya, Michio; Koizumi, Mitsuo

Proceedings of INMM 57th Annual Meeting (Internet), 9 Pages, 2016/07

Isotope-specific $$gamma$$-rays emitted in the nuclear resonance fluorescence (NRF) process provide a good technique for a non-destructive detection and assay of nuclear materials. We are developing technologies relevant to $$gamma$$-ray nondestructive detection and assay utilizing NRF. A Monte Carlo code to simulate NRF process is necessary for design and evaluation of NDA systems. We are developing NRFGeant4, a Geant4-based simulation code, for this purpose. In NRF experiments, highly-enriched targets are generally used such that the NRF signals are dominant and easily measured. In contrast, a real situation may involve very small contents of isotopes of interest. This results in a difficulty in measuring NRF signals because of the interference with other interactions, e.g. elastic scattering. For example, a typical nuclear fuel pellet contains about 90% of $$^{238}$$U as a host material and less than 1% of $$^{239}$$Pu as an isotope of interest. When measuring NRF of $$^{239}$$Pu, there would be a huge background coming from the elastic scattering of $$^{238}$$U. Therefore, an estimation of the elastic scattering with the host material is essential for precise determination of isotope of interest. Satisfying estimation of elastic scattering is currently not available except for some calculations. In the present study, we upgrade our simulation code to include the calculation of elastic scattering events.

Journal Articles

Enabling ${{it in situ }}$ thermometry using transmission nuclear resonance fluorescence

Angell, C.

Nuclear Instruments and Methods in Physics Research B, 368, p.9 - 14, 2016/02

 Times Cited Count:1 Percentile:83.2(Instruments & Instrumentation)

Journal Articles

Journal Articles

Generation and applications of laser Compton scattered $$gamma$$-ray beams

Hajima, Ryoichi; Sawamura, Masaru; Nagai, Ryoji; Nishimori, Nobuyuki; Hayakawa, Takehito; Shizuma, Toshiyuki; Angell, C.

Proceedings of 12th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.79 - 83, 2015/09

Generation of energy-tunable narrow-bandwidth $$gamma$$-rays via Laser Compton Scattering (LCS) is of great interest for scientific studies and applications of MeV photons which interact with nuclei. We are developing technologies relevant to generation of high-brightness LCS $$gamma$$-ray beams. One of the promising applications of such $$gamma$$-rays is the nondestructive detection and assay of nuclides which are necessary for nuclear security and safeguards. We summarize R-and-D status of LCS $$gamma$$-ray sources and overview future applications.

Journal Articles

Demonstrating the integral resonance transmission method; Conceptual and experimental studies

Angell, C.; Hayakawa, Takehito; Shizuma, Toshiyuki; Hajima, Ryoichi; Quiter, B. J.*; Ludewigt, B. L.*; Karwowski, H. J.*; Rich, G.*; Silano, J.*

Proceedings of INMM 56th Annual Meeting (Internet), 9 Pages, 2015/07

Journal Articles

Diffraction of $$gamma$$-rays with energies of 1.17 and 1.33 MeV by a flat Si crystal

Matsuba, Shunya*; Hayakawa, Takehito; Shizuma, Toshiyuki; Nishimori, Nobuyuki; Nagai, Ryoji; Sawamura, Masaru; Angell, C.; Fujiwara, Mamoru; Hajima, Ryoichi

Japanese Journal of Applied Physics, 54(5), p.052203_1 - 052203_5, 2015/05

 Times Cited Count:3 Percentile:80.43(Physics, Applied)

Journal Articles

Method for determining individual deposition velocities of radon progeny

Angell, C.; Pedretti, M.*; Norman, E. B.*

Applied Radiation and Isotopes, 98, p.34 - 39, 2015/04

 Times Cited Count:0 Percentile:100(Chemistry, Inorganic & Nuclear)

Journal Articles

Pulse pileup correction in the presence of a large low-energy background

Angell, C.

Journal of Nuclear Science and Technology, 52(3), p.426 - 433, 2015/03

 Times Cited Count:4 Percentile:54.36(Nuclear Science & Technology)

Journal Articles

Demonstration of a transmission nuclear resonance fluorescence measurement for a realistic radioactive waste canister scenario

Angell, C.; Hajima, Ryoichi; Hayakawa, Takehito; Shizuma, Toshiyuki; Karwowski, H.*; Silano, J.*

Nuclear Instruments and Methods in Physics Research B, 347, p.11 - 19, 2015/03

 Times Cited Count:7 Percentile:33.59(Instruments & Instrumentation)

Journal Articles

Erratum; Evidence for radiative coupling of the pygmy dipole resonance to excited states [Phys. Rev. C 86, 051302(R) (2012)]

Angell, C.; Hammond, S. L.*; Karwowski, H. J.*; Kelley, J. H.*; Krti$v{c}$ka, M.*; Kwan, E.*; Makinaga, Ayano*; Rusev, G.*

Physical Review C, 91(3), p.039901_1 - 039901_2, 2015/03

AA2014-0872.pdf:0.1MB

 Times Cited Count:5 Percentile:22.67(Physics, Nuclear)

Journal Articles

Status of $$gamma$$-ray nondestructive assay by laser Compton scattered source

Hajima, Ryoichi; Shizuma, Toshiyuki; Nagai, Ryoji; Mori, Michiaki; Hayakawa, Takehito; Angell, C.; Seya, Michio

Kaku Busshitsu Kanri Gakkai (INMM) Nippon Shibu Dai-35-Kai Nenji Taikai Rombunshu (Internet), 7 Pages, 2015/01

no abstracts in English

Journal Articles

Improving the assay of $$^{239}$$Pu in spent and melted fuel using the nuclear resonance fluorescence integral resonance transmission method

Angell, C.; Hayakawa, Takehito; Shizuma, Toshiyuki; Hajima, Ryoichi; Quiter, B. J.*; Ludewigt, B. L.*; Karwowski, H.*; Rich, G.*

Nuclear Physics and $$gamma$$-ray sources for Nuclear Security and Nonproliferation, p.133 - 141, 2014/12

Journal Articles

Validating resonance properties using nuclear resonance fluorescence

Angell, C.; Hajima, Ryoichi; Hayakawa, Takehito; Shizuma, Toshiyuki; Karwowski, H.*; Silano, J.*

Physical Review C, 90(5), p.054315_1 - 054315_6, 2014/11

AA2014-0567.pdf:0.3MB

 Times Cited Count:5 Percentile:54.9(Physics, Nuclear)

Journal Articles

Erratum; "Concepts in nuclear science illustrated through experiments with radon" [Am. J. Phys. 80, 61-65 (2012)]

Angell, C.; Kaplan, A.*; Seelig, J. D.*; Norman, E. B.*; Pedretti, M.*

American Journal of Physics, 82(8), P. 802, 2014/08

 Times Cited Count:0 Percentile:100(Education, Scientific Disciplines)

Journal Articles

Improvement to the semi-empirical germanium detector response model at the Compton edge

Angell, C.

Nuclear Instruments and Methods in Physics Research A, 752, p.33 - 35, 2014/07

 Times Cited Count:3 Percentile:68.06(Instruments & Instrumentation)

Journal Articles

Application of laser Compton scattered $$gamma$$-ray beams to nondestructive detection and assay of nuclear material

Hajima, Ryoichi; Hayakawa, Takehito; Shizuma, Toshiyuki; Angell, C.; Nagai, Ryoji; Nishimori, Nobuyuki; Sawamura, Masaru; Matsuba, Shunya; Kosuge, Atsushi*; Mori, Michiaki; et al.

European Physical Journal; Special Topics, 223(6), p.1229 - 1236, 2014/05

 Times Cited Count:11 Percentile:54.82(Physics, Multidisciplinary)

Journal Articles

Statistical uncertainties of nondestructive assay for spent nuclear fuel by using nuclear resonance fluorescence

Shizuma, Toshiyuki; Hayakawa, Takehito; Angell, C.; Hajima, Ryoichi; Minato, Futoshi; Suyama, Kenya; Seya, Michio; Johnson, M.*; McNabb, D.*

Nuclear Instruments and Methods in Physics Research A, 737, p.170 - 175, 2014/02

 Times Cited Count:1 Percentile:87.37(Instruments & Instrumentation)

We estimated statistical uncertainties of a nondestructive assay system using nuclear resonance fluorescence (NRF) for spent nuclear fuel including low-concentrations of actinide nuclei with an intense, mono-energetic photon beam. Background counts from radioactive materials inside the spent fuel were calculated with the ORIGEN2.2-UPJ burn-up computer code. Coherent scattering contribution associated with Rayleigh, nuclear Thomson, and Delbr$"u$ck scattering was also considered. Assuming that the total NRF cross sections are in the range of 3 to 100 eV$$cdot$$b at excitation energies of 2.25, 3.5, and 5 MeV, statistical uncertainties of the NRF measurement were estimated. We concluded that it is possible to assay 1% actinide content in the spent fuel with 2.2 to 3.2% statistical precision during 4000 second measurement time for the total integrated cross section of 30 eV$$cdot$$b at excitation energies of 3.5 to 5 MeV.

Journal Articles

Development of basic NDA technologies of nuclear material accountancy of debris of melted fuel formed in severe accidents

Seya, Michio; Harada, Hideo; Kitatani, Fumito; Koizumi, Mitsuo; Tsuchiya, Harufumi; Iimura, Hideki; Kureta, Masatoshi; Takamine, Jun; Hajima, Ryoichi; Hayakawa, Takehito; et al.

Kaku Busshitsu Kanri Gakkai (INMM) Nippon Shibu Dai-34-Kai Nenji Taikai Rombunshu (Internet), 10 Pages, 2013/10

The forming of MF in severe accidents of nuclear reactors such as Units 1 - 3 of Fukushima-Daiichi NPP (Nuclear Power Plant) inevitably change the category of the nuclear reactor from "item facility" to "bulk-handling facility". At removal of the MF it is necessary to break chunks of MF into relatively small blocks by using some tools, resulting in debris that consists of cut or small rock-like debris and particle (or grain)-like debris in bulk form. This paper presents a categorization of debris of MF and two possible non-destructive assay (NDA) technologies for precise measurement which could be applied to the NM accountancy of MF debris. One of them is Neutron Resonance Densitometry (NRD) for particle-like (or grain-like) debris, and another is NRF (Nuclear Resonance Fluorescence) NDA using LCS (Laser Compton Scattered) $$gamma$$-rays (mono-energetic $$gamma$$-rays) for cut or small rock-like debris. The paper also describes about the recent development of these two technologies.

Journal Articles

Statistical precision of ERL-based NDA for spent fuel

Shizuma, Toshiyuki; Hayakawa, Takehito; Angell, C.; Hajima, Ryoichi; Minato, Futoshi; Suyama, Kenya; Seya, Michio

JAEA-Conf 2013-001, p.139 - 141, 2013/09

Nondestructive assay (NDA) of nuclear materials in spent fuel is a crucial technology in nuclear security and safeguards perspectives. A technique based on nuclear resonance fluorescence (NRF) with a mono-energetic $$gamma$$ source is one that has been proposed as such NDA systems. By calculating the background $$gamma$$ rays from spent fuel, the statistical precision of the proposed NRF-based NDA system was evaluated.

Journal Articles

60 (Records 1-20 displayed on this page)