Slowing down of U235 fission products in light media

1972 ◽  
Vol 32 (5) ◽  
pp. 477-479
Author(s):  
V. P. Lutsenko ◽  
N. V. Polyanskii ◽  
S. P. Dobrovol'skii
Keyword(s):  
Fission Products ◽  
Slowing Down ◽  
U235 Fission

Scientific Arguments for New – Deterministic Approach to HLLLW Management

2003 ◽  
Vol 807 ◽  
Author(s):  
Marko M. Ninkovic ◽  
Jagos J. Raicevic
Keyword(s):  
Nuclear Energy ◽  
Fission Products ◽  
Public Perceptions ◽  
Deterministic Approach ◽  
Conceptual Approach ◽  
Slowing Down ◽  
Waste Storage ◽  
Time Period ◽  
Technical Solutions ◽  
Scientific Arguments

ABSTRACTOne of the greatest challenges in the use of nuclear energy is the high radioactive long-lived waste which is generated during production. It must be dealt with safely and effectively. While technical solutions exist, including deep geological repositories, progress in the disposal of radioactive waste has been influenced, and in many cases delayed, by public perceptions about the safety of the technology. One of the primary reasons for this is the long life of many of radionuclides, actinides and fission products, with half-lives on the order of a hundred thousand to a millions years. Problems of perceptions could be reduced significantly, according to our and many others author's opinion, if there were a way to burn or destroy the most toxic long-lived radioactive wastes. As there are no industrial methods for waste destroying today, in this paper it was suggested a new hybrid, deterministic approach: instead of final waste disposal, long-termed but yet temporal storage only, striving towards final destruction once the appropriate conditions are maintained. This new or modified old approach could affect current HLLLW management and related activities in: changes of processing technology; prolonging the time period of waste storage at temporal depositories; increasing the investment into research regarding the methods and technologies for destructions of these materials, and slowing down the investments into the very expensive final disposal repositories. It is authors' opinion that such deterministic, conceptual approach would contribute the reviving interest in nuclear energy, all over the world and especially in small and developing countries.

scholarly journals Calculated Activities and Abundances of U235 Fission Products

1959 ◽  
Vol 5 (3) ◽  
pp. 156-185 ◽  
Author(s):  
R. C. Bolles ◽  
N. E. Ballou
Keyword(s):  
Fission Products ◽  
U235 Fission

The yield of U235 fission products in the rare-earth region

Atomic Energy ◽  
1957 ◽  
Vol 3 (7) ◽  
pp. 729-733
Author(s):  
V. K. Gorshkov ◽  
R. N. Ivanov ◽  
G. M. Kukavadze ◽  
I. A. Reformatsky
Keyword(s):  
Rare Earth ◽  
Fission Products ◽  
U235 Fission ◽  
The Rare Earth

A CALORIMETRIC DETERMINATION OF THE AVERAGE KINETIC ENERGY OF THE FRAGMENTS FROM U235 FISSION

1955 ◽  
Vol 33 (7) ◽  
pp. 357-363 ◽  
Author(s):  
R. B. Leachman ◽  
W. D. Schafer
Keyword(s):  
Kinetic Energy ◽  
Average Energy ◽  
Fission Products ◽  
Average Kinetic Energy ◽  
U235 Fission ◽  
Induced Fission ◽  
Differential Calorimeter ◽  
Calorimetric Determination ◽  
Good Agreement

The average heat of thermal-neutron induced fission of U235 has been measured by a differential calorimeter. The average energy per fission observed by the calorimeter was 170.1 ± 1.2 Mev. On the basis of the thicknesses of the calorimeter materials and the theoretical energy loss equation, the β energy per fission observed by the calorimeter is 3.0 ± 1 Mev. and, on the same basis, the γ and neutron energy observed is negligible. The resulting 167.1 ± 1.6 Mev. for the average kinetic energy of the fission products is shown to be in good agreement with less direct determinations of this quantity.

Yield of Photoneutrons from U235 Fission Products in Beryllium and Deuterium

1956 ◽  
Vol 27 (1) ◽  
pp. 18-22 ◽  
Author(s):  
S. Bernstein ◽  
W. K. Ergen ◽  
F. L. Talbott ◽  
J. K. Leslie ◽  
C. P. Stanford
Keyword(s):  
Fission Products ◽  
U235 Fission

New or Modified Old Conceptual Approach to HLLLW Management

2001 ◽  
Author(s):  
Marko M. Ninkovic ◽  
Jagos J. Raicevic
Keyword(s):  
Nuclear Energy ◽  
Hybrid Approach ◽  
Fission Products ◽  
Public Perceptions ◽  
Conceptual Approach ◽  
Slowing Down ◽  
Waste Storage ◽  
Time Period ◽  
The World ◽  
Technical Solutions

Abstract One of the greatest challenges in the use of nuclear energy is the high radioactive long-lived waste which is generated during production. It must be dealt with safely and effectively. While technical solutions exist, including deep geological repositories, progress in the disposal of radioactive waste has been influenced, and in many cases delayed, by public perceptions about the safety of the technology. One of the primary reasons for this is the long life of many of radionuclides, actinides and fission products, with half-lives on the order of a hundred thousand to a million years. Problems of perceptions could be reduced significantly, according to our and many others author’s opinion, if there were a way to burn or destroy the most toxic long-lived radioactive wastes. As there are no industrial methods for waste destroying today, in this paper it was suggested a new hybrid approach: instead of final waste disposal, long-termed but yet temporal storage only, striving towards final destruction once a appropriate conditions are maintained. This new or modified old approach could affect current HLLLW management and related activities in: changes of processing technology; prolonging the time period of waste storage at temporal depositories; increasing the investment into research regarding the methods and technologies for destructions of these materials, and slowing down the investments into the very expensive final disposal repositories. It’s authors opinion that such conceptual approach would contribute the reviving interest in nuclear energy, all over the world and especially in small and developing countries.

Determination of the mean primary charge of U235 fission products

1964 ◽  
Vol 54 ◽  
pp. 586-614 ◽  
Author(s):  
P. Armbruster ◽  
D. Hovestadt ◽  
H. Meister ◽  
H.J. Specht
Keyword(s):  
Fission Products ◽  
U235 Fission ◽  
The Mean

Slowing Down Distribution of U235 Fission Neutrons from a Point Source in Light Water

1955 ◽  
Vol 26 (8) ◽  
pp. 1013-1017 ◽  
Author(s):  
J. E. Hill ◽  
L. D. Roberts ◽  
T. E. Fitch
Keyword(s):  
Point Source ◽  
Light Water ◽  
Slowing Down ◽  
U235 Fission ◽  
Fission Neutrons

Nuclear Processes Related to the Ap Stars and the Heaviest Chemical Elements

1976 ◽  
Vol 32 ◽  
pp. 169-182
Author(s):  
B. Kuchowicz
Keyword(s):  
Nuclear Physics ◽  
Nuclear Reactions ◽  
Chemical Elements ◽  
Fission Products ◽  
Abundance Pattern ◽  
Isotopic Shifts ◽  
Processed Material ◽  
R Process ◽  
Ap Stars ◽  
Nuclear Processes

SummaryIsotopic shifts in the lines of the heavy elements in Ap stars, and the characteristic abundance pattern of these elements point to the fact that we are observing mainly the products of rapid neutron capture. The peculiar A stars may be treated as the show windows for the products of a recent r-process in their neighbourhood. This process can be located either in Supernovae exploding in a binary system in which the present Ap stars were secondaries, or in Supernovae exploding in young clusters. Secondary processes, e.g. spontaneous fission or nuclear reactions with highly abundant fission products, may occur further with the r-processed material in the surface of the Ap stars. The role of these stars to the theory of nucleosynthesis and to nuclear physics is emphasized.

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