Toward the Suppression of the Release of Tritium Generated by Neutron Spallation Source at J-PARC

Liquid Pb–Bi eutectic alloy has been selected as coolant and neutron spallation source for the development of MYRRHA, an accelerator driven system. The alloy has been characterized in liquid state from melting (125 °C) to 650 °C by mechanical spectroscopy. Experiments have been carried out using hollow reeds of austenitic stainless steel filled with the Pb-Bi alloy and sealed at the extremities. From 350 °C to 520 °C modulus shows a remarkable drop accompanied by a broad internal friction maximum. In the same temperature range radial distribution functions, determined from X-ray diffraction patterns, evidenced variations of the mean distance between the 1st nearest neighbour atoms. The anelastic phenomena have been attributed to a structural re-arrangement of liquid metal. For comparison, other alloys of the Pb-Bi system with hypo-eutectic composition have been investigated.

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4D Bragg Edge Tomography of Directional Ice Templated Graphite Electrodes

Journal of Imaging ◽

10.3390/jimaging6120136 ◽

2020 ◽

Vol 6 (12) ◽

pp. 136

Author(s):

Ralf F. Ziesche ◽

Anton S. Tremsin ◽

Chun Huang ◽

Chun Tan ◽

Patrick S. Grant ◽

...

Keyword(s):

Li Ion Battery ◽

Graphite Electrodes ◽

Neutron Spallation Source ◽

Spallation Source ◽

Li Ion ◽

Tomography Method ◽

First Time ◽

Pulsed Neutron ◽

Tomography Data ◽

Insight Into

Bragg edge tomography was carried out on novel, ultra-thick, directional ice templated graphite electrodes for Li-ion battery cells to visualise the distribution of graphite and stable lithiation phases, namely LiC12 and LiC6. The four-dimensional Bragg edge, wavelength-resolved neutron tomography technique allowed the investigation of the crystallographic lithiation states and comparison with the electrode state of charge. The tomographic imaging technique provided insight into the crystallographic changes during de-/lithiation over the electrode thickness by mapping the attenuation curves and Bragg edge parameters with a spatial resolution of approximately 300 µm. This feasibility study was performed on the IMAT beamline at the ISIS pulsed neutron spallation source, UK, and was the first time the 4D Bragg edge tomography method was applied to Li-ion battery electrodes. The utility of the technique was further enhanced by correlation with corresponding X-ray tomography data obtained at the Diamond Light Source, UK.

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Austria wants to build a neutron spallation source. The Austron Proposal

Europhysics news ◽

10.1007/s00770-999-0100-1 ◽

1999 ◽

Vol 30 (4) ◽

pp. 100-100

Author(s):

Philip Bryant ◽

Albert Furrer ◽

Erich Griesmayer ◽

Erwin Jericha ◽

Helmut Rauch ◽

...

Keyword(s):

Neutron Spallation Source ◽

Spallation Source

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Structural Changes of Liquid Pb-Bi Eutectic Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.706-709.878 ◽

2012 ◽

Vol 706-709 ◽

pp. 878-883 ◽

Cited By ~ 4

Author(s):

Paolo Deodati ◽

Franco Gauzzi ◽

Roberto Montanari ◽

Alessandra Varone

Keyword(s):

Dynamic Modulus ◽

Structural Changes ◽

Distribution Functions ◽

X Ray Diffraction ◽

Mechanical Spectroscopy ◽

Neutron Spallation Source ◽

Driven System ◽

Spallation Source ◽

Accelerator Driven System ◽

Diffraction Patterns

Liquid Pb–Bi eutectic (LBE) alloy has been selected as coolant and neutron spallation source for the development of MYRRHA, an accelerator driven system (ADS). The alloy has been characterized in liquid state from melting (125 °C) to 750 °C by mechanical spectroscopy, i.e. internal friction (IF) and dynamic modulus measurements. The experiments have been carried out using hollow reeds of austenitic stainless steel filled with Pb-Bi alloy and sealed at the extremities. Dynamic modulus showed a remarkable drop in the range 350-520 °C. In the same temperature range radial distribution functions (RDFs), determined from X-ray diffraction patterns, evidenced variations of the mean distance between the 1st nearest neighbour atoms. The phenomenon has been explained as a structural re-arrangement of atoms in the liquid metal.

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Elemental Clustering and Structure of Liquid LBE

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.922.785 ◽

2014 ◽

Vol 922 ◽

pp. 785-790

Author(s):

Santosh Balijepalli ◽

Saulius Kaciulis ◽

Matteo Amati ◽

Roberto Montanari ◽

Alessandra Varone

Keyword(s):

Cluster Size ◽

X Ray Diffraction ◽

Progressive Change ◽

Driven Systems ◽

X Ray ◽

Nearest Neighbours ◽

Neutron Spallation Source ◽

Different Temperatures ◽

Spallation Source ◽

Accelerator Driven Systems

Liquid Pb–Bi eutectic (LBE) alloy is of great interest as coolant and neutron spallation source for the accelerator driven systems (ADS). Scanning Photoemission Microscopy (SPEM) at the ELETTRA synchrotron radiation facility of Trieste was carried out on samples quenched from melt at different temperatures. SPEM analyses show that the two components (Pb and Bi) are not homogeneously distributed in the range of temperature from melting up to 518 °C, in particular they form clusters enriched in Pb and Bi. The cluster size decreases as temperature increases hence diffusion occurs between clusters and matrix leading to the progressive disgregation of clusters that is almost completed at 518 °C. Such micro-chemical evolution is accompanied by a structural change of the liquid evidenced by the results of High-temperature X-ray Diffraction (HT-XRD). In particular, radial distribution function (RDF) curves show a progressive change of the ratio between the shell radii of 1st and 2nd nearest neighbours.

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MBGEM: a stack of borated GEM detector for high efficiency thermal neutron detection

The European Physical Journal Plus ◽

10.1140/epjp/s13360-021-01707-2 ◽

2021 ◽

Vol 136 (7) ◽

Author(s):

A. Muraro ◽

G. Claps ◽

G. Croci ◽

C. C. Lai ◽

R. De Oliveira ◽

...

Keyword(s):

Thermal Neutron ◽

Neutron Detector ◽

Large Scale ◽

High Efficiency ◽

Detection Efficiency ◽

Neutron Spallation Source ◽

High Detection Efficiency ◽

Thermal Neutron Detector ◽

Spallation Source ◽

Alpha 7

AbstractA new position-sensitive thermal neutron detector based on boron-coated converters has been developed as an alternative to today’s standard $$^3\mathrm{He}$$ 3 He -based technology for application to thermal neutron scattering. The key elements of the development are the boron-coated GEM foils (Sauli in Nucl Instrum Methods Phys Res Sect A Accel Spectrom Detect Assoc Equip 386:531, 1997) that are used as a multi-layer neutron converter via the $$^{10}\mathrm{B}(n,\alpha )^7\mathrm{Li}$$ 10 B ( n , α ) 7 Li reaction together with an efficient collection of the produced secondary electrons. This paper reports the test performed on a 3 layers converter prototype coupled to a GEMPix detector (Murtas in Radiat Meas 138:106421, 2020), carried out in order to study the possibility to produce a large-scale multi-layer neutron detector capable to reach high detection efficiency with high spatial resolution and able to sustain the high neutron flux expected in the new neutron spallation source under development like the ESS.

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Radiochemical separation of 7Be from the cooling water of the neutron spallation source SINQ at PSI

Radiochimica Acta ◽

10.1524/ract.2013.2078 ◽

2013 ◽

Vol 101 (8) ◽

pp. 509-514 ◽

Cited By ~ 11

Author(s):

D. Schumann ◽

M. Ayranov ◽

T. Stowasser ◽

L. Gialanella ◽

A. di Leva ◽

...

Keyword(s):

Ion Beam ◽

Cooling Water ◽

Fast Neutrons ◽

Separation System ◽

Highly Active ◽

Spallation Reactions ◽

Beam Production ◽

Neutron Spallation Source ◽

Spallation Source ◽

Cooling Loop

Summary 7Be is a key radionuclide for investigation of several astrophysical processes and phenomena. In addition, it is used as a tracer in wear measurements. It is produced in considerable amounts in the cooling water (D2O) of the Spallation Induced Neutron Source (SINQ) facility at PSI by spallation reactions on 16O with the generated fast neutrons. A shielded ion-exchange filter containing 100 mL of the mixed-bed ion exchanger LEWATIT was installed as a bypass for the cooling water into the cooling loop of SINQ for three months. The collected activity of 7Be was in the range of several hundred GBq. Further, the 7Be was separated and purified in a hot-cell remotely-controlled using a separation system installed. With the exception of 10Be, radioactive byproducts can be neglected, so that this cooling water could serve as an ideal source for highly active 7Be-samples. The facility is capable of producing 7Be with activities up to 1 TBq per year. The 7Be sample preparation is described in detail and the possible uses are discussed. In particular some preliminary results of 7Be ion beam production are presented.

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