scholarly journals A High-Resolution Study of the 110Tc → 110Ru → 110Rh → 110Pd Decay Chain with the GRETINA Array

2020 ◽  
Vol 1643 ◽  
pp. 012140
Author(s):  
S. Jazrawi ◽  
D.T. Doherty ◽  
J.M. Allmond ◽  
P.H. Regan ◽  
R.V.F. Janssens ◽  
...  
Keyword(s):  
High Resolution ◽  
Decay Chain ◽  
Resolution Study

Reduction of the radiation in radioactive substances

2020 ◽  
Vol 34 (04) ◽  
pp. 2050001
Author(s):  
Gianni Albertini ◽  
Fabio Cardone ◽  
Giovanni Cherubini ◽  
Ettore Guerriero ◽  
Alberto Rosada
Keyword(s):  
Weak Interaction ◽  
Decay Constant ◽  
Nuclear Reactions ◽  
Decay Chain ◽  
Ultrasound Treatment ◽  
Radioactive Substances

The radioactivity reduction of a system containing Ni-63 radioactive nuclei after an appropriate ultrasound treatment in an apparatus designed on purpose is reported. The application of ultrasounds for 200 s resulted in the partial disappearance of about 13% of the radioactive Ni-63 nuclei and the appearance of nonradioactive elements. The formation of new elements, not belonging to the decay chain of Nickel-63, is a strong issue where strong nuclear reactions transform Nickel into different elements rather than the usual weak interaction, responsible for the decay, which is accelerated. This way, the time necessary to halve the intensity is shortened by about 20 years, without altering the Ni-63 decay constant, which is [Formula: see text] years. Two cases producing similar effects in other radioactive systems after ultrasound treatment are described in the literature and support this finding, which is not forecast by the commonly accepted theories. A theory able to explain these and other results is also reported.

scholarly journals Post-Closure Safety Analysis of Nuclear Waste Disposal in Deep Vertical Boreholes

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6356
Author(s):  
Stefan Finsterle ◽  
Richard A. Muller ◽  
John Grimsich ◽  
Ethan A. Bates ◽  
John Midgley
Keyword(s):  
Land Surface ◽  
Spent Nuclear Fuel ◽  
Hydrological Cycle ◽  
Decay Chain ◽  
Geothermal Gradient ◽  
Great Depth ◽  
Salinity Stratification ◽  
Integrated Simulation ◽  
Safety Features ◽  
The Impact

Isolation of spent nuclear fuel assemblies in deep vertical boreholes is analyzed. The main safety features of the borehole concept are related to the repository’s great depth, implying (a) long migration distances and correspondingly long travel times, allowing radionuclides to decay, (b) separation of the repository from the dynamic hydrological cycle near the land surface, (c) stable geological and hydrogeological conditions, and (d) a geochemically reducing environment. An integrated simulation model of the engineered and natural barrier systems has been developed to examine multiple scenarios of the release of radionuclides from the waste canisters, the transport through a fractured porous host rock, and the extraction of potentially contaminated drinking water from an aquifer. These generic simulations include thermal effects from both the natural geothermal gradient and the heat-generating waste, the influence of topography on regional groundwater flow, moderated by salinity stratification at depth, and the role of borehole sealing. The impact of these processes on the transport of select radionuclides is studied, which include long-lived, soluble, sorbing or highly mobile isotopes along with a decay chain of safety-relevant actinide metals. The generic analyses suggest that a deep vertical borehole repository has the potential to be a safe option for the disposal of certain waste streams, with the depth itself and the stable hydrogeological environment encountered in the emplacement zone providing inherent long-term isolation, which allows for reduced reliance on a complex engineered barrier system.

Natural Radioactivity in Clay Ceramics and their Raw Materials in Latvia

2018 ◽  
Vol 788 ◽  
pp. 51-55
Author(s):  
Daina Riekstina ◽  
Tamara Krasta ◽  
Ruta Švinka
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
Activity Index ◽  
Natural Radionuclides ◽  
Natural Radionuclide ◽  
Decay Chain ◽  
Activity Level ◽  
Clay Bricks ◽  
Baltic Countries ◽  
Clay Ceramics

Natural radionuclides K-40, and Th-232, U-238 (Ra-226) decay chain products contained in building materials are the main source of radiation dose received by population and the only source of indoor radiation exposure. Present work contains results of the study of natural radionuclide activity level in clay, clay ceramics and silica bricks used in Latvia. Obtained data show that radionuclide content in different clay products can differ up to five times. However, determined activity index values for all tested materials, except fireproof bricks, were below radionuclide concentration level permitted by EU and Latvian national regulations. Comparison with analogous data from other North European and Baltic countries shows that average concentrations of natural radionuclides and activity index values for clay and clay bricks used in Latvia are on the same level as in other countries, except Sweden.

The 130Nd↦130Pr↦130Ce decay chain revisited

2001 ◽  
Vol 12 (3) ◽  
pp. 309-316 ◽  
Author(s):  
A. Gizon ◽  
J. Genevey ◽  
C.F. Liang ◽  
P. Paris ◽  
D. Barnéoud ◽  
...  
Keyword(s):  
Decay Chain

scholarly journals Atmospheric Neutrinos

2012 ◽  
Vol 2012 ◽  
pp. 1-24 ◽  
Author(s):  
Takaaki Kajita
Keyword(s):  
Atmospheric Neutrino ◽  
Decay Chain ◽  
Muon Neutrinos ◽  
Atmospheric Neutrinos ◽  
Electron Neutrinos ◽  
Tau Neutrinos ◽  
Decay Products ◽  
Charged Pions ◽  
Neutrino Experiments ◽  
Energy Dependent

Atmospheric neutrinos are produced as decay products in hadronic showers resulting from collisions of cosmic rays with nuclei in the atmosphere. Electron-neutrinos and muon-neutrinos are produced mainly by the decay chain of charged pions to muons to electrons. Atmospheric neutrino experiments observed zenith angle and energy-dependent deficit of muon-neutrino events. It was found that neutrino oscillations between muon-neutrinos and tau-neutrinos explain these data well. This paper discusses atmospheric neutrino experiments and the neutrino oscillation studies with these neutrinos.

Quasiparticle structure of superheavy nuclei along theα-decay chain of115288

2015 ◽  
Vol 92 (1) ◽  
Author(s):  
A. N. Bezbakh ◽  
V. G. Kartavenko ◽  
G. G. Adamian ◽  
N. V. Antonenko ◽  
R. V. Jolos ◽  
...  
Keyword(s):  
Decay Chain ◽  
Superheavy Nuclei

Discovery of the [sup 109]Xe→[sup 105]Te→[sup 101]Sn alpha decay chain

2007 ◽  
Author(s):  
S. N. Liddick ◽  
R. Grzywacz ◽  
C. Mazzocchi ◽  
R. D. Page ◽  
K. P. Rykaczewski ◽  
...  
Keyword(s):  
Decay Chain ◽  
Alpha Decay
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