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Journal Articles

JAEA-ISCN development programs of advanced NDA technologies of nuclear material

Seya, Michio; Kobayashi, Naoki; Naoi, Yosuke; Hajima, Ryoichi; Soyama, Kazuhiko; Kureta, Masatoshi; Nakamura, Hironobu; Harada, Hideo

Book of Abstracts, Presentations and Papers of Symposium on International Safeguards; Linking Strategy, Implementation and People (Internet), 8 Pages, 2015/03

JAEA-ISCN has been implementing basic development programs of the advanced NDA technologies for nuclear material (NM) since 2011JFY (Japanese Fiscal Year), which are (1) NRF (Nuclear resonance fluorescence) NDA technology using laser Compton scattered (LCS) $$gamma$$-rays (intense mono-energetic $$gamma$$-rays), (2) Alternative to $$^{3}$$He neutron detection technology using ZnS/B$$_{2}$$O$$_{3}$$ ceramic scintillator, and (3) NRD (Neutron resonance densitometry) using NRTA (Neutron resonance transmission analysis) and NRCA (Neutron resonance capture analysis). These programs are going to be finished in 2014JFY and have demonstration tests in February - March 2015.

Journal Articles

Introduction to development of advanced safeguards and security NDA technologies by JAEA-ISCN

Seya, Michio; Kureta, Masatoshi; Soyama, Kazuhiko; Nakamura, Hironobu; Harada, Hideo; Hajima, Ryoichi

Proceedings of INMM 55th Annual Meeting (Internet), 10 Pages, 2014/07

JAEA has been implementing development programs of basic technologies of the following advanced NDA (non-destructive assay) of nuclear material (NM) for nuclear safeguards and security. (1) Alternative to $$^{3}$$He neutron detection using ZnS/B$$_{2}$$O$$_{3}$$ ceramic scintillator, (2) NRD (neutron resonance densitometry) using NRTA (neutron resonance transmission analysis) and NRCA (neutron resonance capture analysis), (3) NRF (nuclear resonance fluorescence)-NDA using laser Compton scattered (LCS) $$gamma$$-rays (intense mono-energetic $$gamma$$-rays). The development program (1) is for NDA systems that use ZnS/B$$_{2}$$O$$_{3}$$ ceramic scintillator as alternative neutron detector to $$^{3}$$He for coming shortage of its supply. The program (2) is for a NDA system of isotopic composition measurement (non-destructive mass spectroscopy) in targets such as particle-like melted fuel debris using NRTA and NRCA. The program (3) is for NDA systems using a specific NRF reaction of certain Pu/U isotope caused by mono-energetic LCS $$gamma$$-ray with energy tuned to the specific excited state of the isotope. This paper introduces above three programs.

Oral presentation

Anticipations of NRF-based NDA of nuclear material using monochromatic $$gamma$$-ray beams

Seya, Michio; Hajima, Ryoichi*; Hayakawa, Takehito*; Koizumi, Mitsuo

no journal, , 

The NRF-base NDA using monochromatic $$gamma$$-rays would be used in nuclear security for secure detection of NM in thick shield and also for precise checking of interior structures of detected / suspicious objects. This NDA also would be used in nuclear safeguards for precise quantification of U/Pu isotopes in high radiation background, such as spent fuel assemblies / melted fuel debris in a canister. It is also useful for precise measurement of quantities of minor actinide isotopes in ADS (Accelerator Driven Sub-critical System; for transmutation of long-half-life minor actinides (MA)) fuels before and after irradiation in the ADS reactor core. In this presentation, we show actual NRF-NDA methods for these objects.

Oral presentation

ERL based Laser-Compton sources and applications

Hajima, Ryoichi; Seya, Michio

no journal, , 

The QST and the JAEA are proposing an ERL (energy recovery linac) -based Compton source to produce high flux photons (1013 ph/s) in MeV region with energy tenability for non-destructive assay (NDA) of all nuclides (including nuclear materials (NM)) utilizing nuclear resonant fluorescence (NRF). We can apply the proposed NDA system to nuclear security and nuclear safeguards for analyzing NM in severe conditions such as under very high radiation background or in deep inside material. For these applications we have studied NDA of isotopes in transmission geometry for measurement of NM inside a thick wall canister and in scattering geometry for measurement of NMs of spent fuel in water or detection of NM in a heavy shield. We present our efforts on these.

Oral presentation

Validating elastic scattering of polarized $$gamma$$-rays

Omer, M.; Shizuma, Toshiyuki*; Hajima, Ryoichi*; Angell, C.*

no journal, , 

An elastic scattering experiment has been performed using 100% linearly polarized $$gamma$$-rays generated by laser Compton backscattering at Duke University, NC, USA. Photons of energy of 2 MeV elastically scattered off uranium target were measured with high-purity Ge detectors. The results are used in the simulation study to improve the sensitivity of identifying isotopes by nuclear resonance fluorescence. Validation of the elastic scattering cross section of a polarized $$gamma$$-rays is reported.

Oral presentation

Parities of low-energy states in Hf and W isotopes

Omer, M.; Shizuma, Toshiyuki*; Hajima, Ryoichi*; Koizumi, Mitsuo

no journal, , 

Nuclear resonance fluorescence experiments have been performed on Hf and W natural targets in the 2.5-3.1 MeV energy range using quasi monochromatic $$gamma$$-ray beams generated from laser Compton scattering at the HI$$gamma$$S facility, Duke University. The complete polarization of the incident $$gamma$$-rays has provided the determination of the parity of states in this energy range. Results of these experiment have revealed the parity of about 15 levels in Hf and W nuclei. Such data provide knowledge about the nondestructive detection system of nuclear material by understanding the so-called scissors mode encountered in deformed nuclei including uranium and plutonium isotopes.

Oral presentation

Measurements of magnetic dipole strength in Pu-239 using nuclear resonance fluorescence

Shizuma, Toshiyuki; Angell, C.*; Hajima, Ryoichi; Ludewigt, B.*; Quiter, B. J.*; Koizumi, Mitsuo

no journal, , 

Nuclear resonance transmission $$gamma$$-rays through a Pu-239 target were measured, as a part of a development project of nuclear material non-destructive detection and assay using quasi-monoenergetic laser Compton scattering (LCS) photon beams. The experiment was carried out at Duke University. We used photon beams at energies of 2.14 with energy width of about 4% to irradiate absorber and scattering targets of Pu-239. We measured scattered $$gamma$$ rays from the scattering target using high-purity Ge detectors. As a result, we found the average integration cross section of 13 eV barn at excitation energies from 2.12 to 2.19 MeV. The sum of the branching ratio from the excited state to the ground and first excited states are 0.4. This enables us to quantify Pu-239 in a assembly with an error of approximately 3% in four-hour measurement with 10$$^{13}$$ photon/s beams. In this presentation, we will report on the measurement method and the experimental results. We will also talk about the future plan for development of non-destructive assay using mono-energetic LCS $$gamma$$-ray beam. (This development was carried out under "the subsidiary for promotion of strengthening nuclear security or the like of MEXT".)

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