scholarly journals Defining Processing Times for Accelerator Produced 225Ac and Other Isotopes from Proton Irradiated Thorium

Molecules ◽  
2019 ◽  
Vol 24 (6) ◽  
pp. 1095 ◽  
Author(s):  
Jonathan Fitzsimmons ◽  
Justin Griswold ◽  
Dmitri Medvedev ◽  
Cathy Cutler ◽  
Leonard Mausner
Keyword(s):  
Cross Sections ◽  
Proton Irradiation ◽  
High Energy ◽  
Time Dependent ◽  
High Energy Proton ◽  
Processing Times ◽  
Energy Proton ◽  
Thorium Target

During the purification of radioisotopes, decay periods or time dependent purification steps may be required to achieve a certain level of radiopurity in the final product. Actinum-225 (Ac-225), Silver-111 (Ag-111), Astatine-211 (At-211), Ruthenium-105 (Ru-105), and Rhodium-105 (Rh-105) are produced in a high energy proton irradiated thorium target. Experimentally measured cross sections, along with MCNP6-generated cross sections, were used to determine the quantities of Ac-225, Ag-111, At-211, Ru-105, Rh-105, and other co-produced radioactive impurities produced in a proton irradiated thorium target at Brookhaven Linac Isotope Producer (BLIP). Ac-225 and Ag-111 can be produced with high radiopurity by the proton irradiation of a thorium target at BLIP.

Measurements of Displacement Cross Section of Tungsten under 389-MeV Proton Irradiation and Thermal Damage Recovery

2021 ◽  
Vol 1024 ◽  
pp. 95-101
Author(s):  
Yosuke Iwamoto ◽  
Makoto Yoshida ◽  
Hiroki Matsuda ◽  
Shin Ichiro Meigo ◽  
Daiki Satoh ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Thermal Conduction ◽  
Thermal Damage ◽  
Proton Irradiation ◽  
High Energy ◽  
Wire Sample ◽  
Energy Proton ◽  
Measured Displacement ◽  
Mev Protons

For validating the number of displacements per atom (dpa) for tungsten under high-energy proton irradiation, we measured displacement cross sections related to defect-induced electrical resistivity changes in a tungsten wire sample under irradiation with 389-MeV protons under 10 K. The Gifford–McMahon cryocooler was used to cool the sample using a conductive coolant via thermal conduction plates of oxygen-free high-conductivity copper and electrical insulation sheets of aluminum nitride ceramic. In this experiment, the displacement cross section was 1612 ± 371 b for tungsten at 389 MeV. A comparison of the experimental displacement cross sections of tungsten with the calculated results obtained using Norgett–Robinson–Torrens (NRT) dpa and athermal recombination-corrected (arc) dpa cross sections indicates that arc-dpa was in better agreement with the experimental data than NRT-dpa; this is similar to the displacement cross sections of copper. From the measurements of damage recovery of the accumulated defects in tungsten through isochronal annealing, which is related to the defect concentration of the sample, approximately 20% of the damage was recovered at 60 K. This trend was similar to those observed in other experimental results for reactor neutrons.

scholarly journals Effect of high energy proton irradiation on MAPbI3 films for space applications observed by micro-Raman spectroscopy

2020 ◽  
Vol 1 (6) ◽  
pp. 2068-2073
Author(s):  
Walter O. Herrera Martínez ◽  
Paula Giudici ◽  
Natalia B. Correa Guerrero ◽  
M. Luján Ibarra ◽  
M. Dolores Perez
Keyword(s):  
Thin Film ◽  
Raman Spectroscopy ◽  
Proton Irradiation ◽  
High Energy ◽  
High Energy Proton ◽  
Space Applications ◽  
Micro Raman Spectroscopy ◽  
Energy Proton

10 MeV proton irradiation of a MAPbI3 thin film causes PbO formation when the surface is exposed to an O2 atmosphere.

Strongly enhanced flux pinning by high‐energy proton irradiation of a Tl2Ca2Ba2Cu3Oysingle crystal

1990 ◽  
Vol 56 (24) ◽  
pp. 2456-2458 ◽  
Author(s):  
E. L. Venturini ◽  
J. C. Barbour ◽  
D. S. Ginley ◽  
R. J. Baughman ◽  
B. Morosin
Keyword(s):  
Flux Pinning ◽  
Proton Irradiation ◽  
High Energy ◽  
High Energy Proton ◽  
Energy Proton

scholarly journals Highest energy proton–nucleus cross-sections

2018 ◽  
Vol 33 (40) ◽  
pp. 1850242 ◽  
Author(s):  
L. Stodolsky
Keyword(s):  
Cosmic Rays ◽  
Cross Sections ◽  
High Energy ◽  
High Energy Proton ◽  
Proton Proton ◽  
Energy Proton ◽  
Black Disc ◽  
Simple Generalization ◽  
Very High Energy ◽  
Very High

The description of very high energy proton–proton cross-sections in terms of a “black disc” with an “edge” allows a simple generalization to highest energy proton–nucleus cross-sections. This results in a leading ln2W term and a ln W term whose coefficient depends linearly on the radius of the nucleus (W the c.m. energy). The necessary parameters are determined from the fits to p–p data. Since the coefficient of the ln W term is rather large, it is doubtful that the regime of ln2W dominance can be reached with available energies in accelerators or cosmic rays. However, the ln W term can be relevant for highest energy cosmic rays in the atmosphere, where a large increase for the cross-section on nitrogen is expected. Tests of the theory should be possible by studying the coefficient of ln W at p-nucleus colliders.

scholarly journals Potential for neutron and proton transmutation doping of GaN and Ga2O3

2020 ◽  
Vol 1 (1) ◽  
pp. 45-53
Author(s):  
Julie V. Logan ◽  
Elias B. Frantz ◽  
Lilian K. Casias ◽  
Michael P. Short ◽  
Christian P. Morath ◽  
...  
Keyword(s):  
Proton Irradiation ◽  
High Energy ◽  
High Energy Proton ◽  
Energy Proton ◽  
Transmutation Doping ◽  
P Type

High energy proton irradiation produces long-lived p-type doping in GaN and Ga2O3.

Proton-proton scattering at the C. E. R. N. Intersecting Storage Rings

1973 ◽  
Vol 335 (1603) ◽  
pp. 431-452 ◽  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
High Energy ◽  
Storage Rings ◽  
The Other ◽  
Proton Scattering ◽  
High Energy Proton ◽  
Proton Proton ◽  
Total Cross Sections ◽  
Energy Proton

The main features of the C. E. R. N. Intersecting Storage Rings (I. S. R.) are reviewed, together with results obtained in 1971 and 1972 on elastic scattering and total cross-sections. The main result is a 10% increase of the total proton-proton cross-section in the I. S. R. energy range. The simplest picture of high energy proton-proton scattering which emerges from this and the other data, is briefly discussed.

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