Yields of rare earth fission products in the spontaneous fission of californium-252

1985 ◽  
Vol 91 (2) ◽  
pp. 291-296
Author(s):  
B. S. Tomar ◽  
H. Naik ◽  
A. Ramaswamy ◽  
Satya Prakash
Keyword(s):  
Rare Earth ◽  
Spontaneous Fission ◽  
Fission Products

scholarly journals Parameter Optimization and Sensitivity Studies of Spontaneous Fission with FREYA

2020 ◽  
Vol 239 ◽  
pp. 05003
Author(s):  
R. Vogt ◽  
J. Randrup ◽  
P. Talou ◽  
J. T. Van Dyke ◽  
L. A. Bernstein
Keyword(s):  
Spontaneous Fission ◽  
Fission Products ◽  
Event Analysis ◽  
Fission Reaction ◽  
Fission Event ◽  
Large Samples ◽  
Yield Functions ◽  
Sensitivity Studies ◽  
Average Neutron ◽  
Kinematic Information

For many years, the state of the art for simulating fission in transport codes amounted to sampling from average distributions. However, such "average" fission models have limited capabilities. Energy is not explicitly conserved and no correlations are available because all particles are emitted independently. However, in a true fission event, the emitted particles are correlated. Recently, Monte Carlo codes generating complete fission events have been developed, thus allowing the use of event-by-event analysis techniques. Such techniques are particularly useful because the complete kinematic information is available for the fission products and the emitted neutrons and photons. It is therefore possible to extract any desired observables, including correlations. The fast event-by-event fission code FREYA (Fission Reaction Event Yield Algorithm) generates large samples of complete fission events, employing only a few physics-based parameters. A recent optimization of these parameters for the isotopes in FREYA that undergo spontaneous fission is described and results are presented. The sensitivity of neutron observables in FREYA to the input yield functions is also discussed and the correlation between the average neutron multiplicity and fragment total kinetic energy is quantified.

Removal of Fission Products in the Spent Electrolyte Using Iron Phosphate Glass as a Sorbent

2010 ◽  
Author(s):  
Ippei Amamoto ◽  
Naoki Mitamura ◽  
Tatsuya Tsuzuki ◽  
Yasushi Takasaki ◽  
Atsushi Shibayama ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Phosphate Glass ◽  
Alkali Metals ◽  
Fission Products ◽  
Iron Phosphate ◽  
Experimental Result ◽  
Filtration Method ◽  
High Level ◽  
Filtration Experiment

This study is carried out to make the pyroprocessing hold a competitive advantage from the viewpoint of environmental load reduction and economical improvement. As one of the measures to reduce the volume of the high-level radioactive waste (HLW), the phosphate conversion method is applied for removal of fission products (FP) from the melt, referring to the spent electrolyte in this paper. Among the removing target chlorides in the spent electrolyte i.e., alkali metals, alkaline earth metals and rare earth elements, only the rare earth elements and lithium form the precipitates as insoluble phosphates by reaction with Li3PO4. The sand filtration method was applied to separate FP precipitates from the spent electrolyte. The iron phosphate glass (IPG) powder, which is a compatible material for the immobilization of FP, was used as a filter medium. After filtration experiment, it was proven that insoluble FP could almost be completely removed from the spent electrolyte. Subsequently, we attempted to separate the dissolved FP from the spent electrolyte. The IPG was being used once again but this time as a sorbent instead. This is possible because the IPG has some unique characteristics, e.g., changing the valence of iron, which is one of its network modifiers due to its manufacturing temperature. Therefore, it would be likely to sorb some FP when the chemical condition of IPG is unstable. We produced three kinds of IPG under different manufacturing temperature and confirmed that those glasses could sorb FP as anticipated. According to the experimental result, its sorption efficiency of metal cations was attained at around 20–40%.

Synthesis of rare earth phosphates in molten LiCl–KCl eutectic: Application to preliminary treatment of chlorinated waste streams containing fission products

2008 ◽  
Vol 381 (3) ◽  
pp. 284-289 ◽  
Author(s):  
Damien Hudry ◽  
Isabelle Bardez ◽  
Aydar Rakhmatullin ◽  
Catherine Bessada ◽  
Florence Bart ◽  
...  
Keyword(s):  
Rare Earth ◽  
Fission Products ◽  
Preliminary Treatment ◽  
Waste Streams

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
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