Chemical Effects of Nuclear Recoil. Alkali Bromates

1963 ◽  
Vol 1 (4) ◽  
Author(s):  
D. J. Apers ◽  
F. G. Dejehet ◽  
B. S. van Outryve D'ydewalle ◽  
P. C. Capron ◽  
J. Jach ◽  
...  
Keyword(s):  
Isotope Effect ◽  
Thermal Annealing ◽  
Irradiation Time ◽  
Natural Abundance ◽  
Potassium Bromate ◽  
Nuclear Recoil ◽  
Chemical Effects ◽  
Influence Of Solvent

SummaryAn attempt is made to explain some of the discrepancies which have been observed when studying the retention of bromine in neutron irradiated bromates. In particular the influence of solvent, irradiation time and thermal annealing is investigated in potassium bromate, lithium (natural abundance) bromate and lithium (depleted inAn explanation is put forward on the basis of an oxygen free intermediate recoil bromine fragment. The isotope effect on bromine recoil is confirmed.

Chemical effects of nuclear recoil: metal phthalocyanines

1962 ◽  
Vol 24 (7) ◽  
pp. 927-930 ◽  
Author(s):  
D.J. Apers ◽  
F.G. Dejehet ◽  
B.S. van Outryve d'Ydewalle ◽  
P.C. Capron
Keyword(s):  
Nuclear Recoil ◽  
Metal Phthalocyanines ◽  
Chemical Effects

scholarly journals Production of 128I Atoms through 127I (n,γ) 128I Reactions in some Solid Iodocompounds using an (241Am-Be) Neutron Source

2011 ◽  
Vol 3 (2) ◽  
pp. 357-366 ◽  
Author(s):  
M. R. Zaman ◽  
M. A. Hossain ◽  
M. J. A. Sarkar
Keyword(s):  
Solid State ◽  
Neutron Source ◽  
Half Life ◽  
Irradiation Time ◽  
Volume Element ◽  
Nuclear Transformation ◽  
Time Decay ◽  
Chemical Effects ◽  
Counting Geometry ◽  
Zero Time

 Present work reports the production of 128I atoms through 127I (n,g) 128I reactions in six iodine containing compounds (viz. NaI, NaIO3, NaIO4, KI, KIO3 and KIO4) in solid state. An  241Am-Be neutron source has been used for the production of 128 I atoms. The radioactivities produced have been measured by a thin end-window G.M. Counter. The irradiation time and counting geometry were constant throughout the present sets of experiments. Results obtained have been analyzed through time-decay analyses. From the decay curves, the half life of 128I  has been estimated ~25 minutes. The average zero time activities of 128I from three independent measurements in each of NaI, NaIO3.H2O, NaIO4, KI, KIO3 and KIO4 target, have been found 116 ± 2, 92 ± 4, 88 ± 6, 102 ± 6, 98 ± 1 and 93 ± 5 cpm respectively. It is interesting to note that the activities show a decreasing trend while passing through either from NaI to NaIO4 or from KI to KIO4. Results are attributed to the quantity of 128I produced in a specified volume element and, self absorption and self scattering of radiations within the target compounds studied.  Keywords: Iodocompounds; 128I; 241Am-Be neutron source; Chemical effects of nuclear transformation.© 2011 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi:10.3329/jsr.v3i2.6385                 J. Sci. Res. 3 (2), 357-366 (2011)

Chemical Effects in Ion Implantation Induced Quantum Well Intermixing

2000 ◽  
Vol 647 ◽  
Author(s):  
Todd W. Simpson ◽  
Paul G. Piva ◽  
Ian V. Mitchell
Keyword(s):  
Quantum Well ◽  
Ion Implantation ◽  
Thermal Annealing ◽  
Rapid Thermal Annealing ◽  
Blue Shift ◽  
Quantum Well Intermixing ◽  
Chemical Effects ◽  
M 31 ◽  
Shift Data ◽  
Fluence Dependence

AbstractIon implantation followed by rapid thermal annealing is used to induce layer intermixing and thus selectively blue-shift the emission wavelength of InP-based quantum well hetero- structures. The intermixing is greatly enhanced over thermal intermixing due to the supersaturation of defects. The magnitude of the observed blue-shift has been studied previously as a function of ion fluence and ion mass: the dependence on ion mass is well established, with heavier ions producing a larger shift. We show here that chemical effects can also play a significant role in determining the induced blue-shift. Data are presented from the implantation of the similar mass ions; aluminum (m~27), silicon (m~28) and phosphorus (m~31). The P- induced blue shift displays a monotonic increase with fluence, consistent with previous studies; however, the fluence dependence of Al- and Si-induced blue-shifts both deviate significantly from the behaviour for P. These results have important implications for attempts to scale intermixing behaviour with ion mass.

Nuclear recoil reactions in organomanganese compounds. IV. Fulvalenehexacarbonyldimanganese

1970 ◽  
Vol 48 (10) ◽  
pp. 1614-1615 ◽  
Author(s):  
I. G. DeJong ◽  
D. R. Wiles
Keyword(s):  
Reaction Zone ◽  
Neutron Capture ◽  
Radiochemical Yield ◽  
Mass Spectrometric ◽  
Nuclear Recoil ◽  
Carbonyl Ligands ◽  
Chemical Effects ◽  
Mass Spectrometric Evidence ◽  
Organomanganese Compounds

The chemical effects of neutron capture have been studied in fulvalenehexacarbonyldimanganese, in order to determine whether or not the ring–ring bond survives nuclear recoil. Retention in the parent form (9.1 %) is comparable to that in other organomanganese compounds, while the radiochemical yield of CpMn(CO)3, the "monomer", is very much lower (0.2%). This suggests that the inter-ring bond is not broken under the conditions in the reaction zone. The formation of radiomanganese compounds with several carbonyl ligands (4.7%) is in accord with mass spectrometric evidence, which suggests that CO may be readily available in the reaction zone.

scholarly journals Enhancement Performance of Hybrid Membrane Zeolite/PES for Produced Water Treatment With Membrane Modification Using Combination of Ulta Violet Irradiation, Composition of Zeolite and Thermal Annealing

2018 ◽  
Vol 156 ◽  
pp. 08002
Author(s):  
Tutuk Djoko Kusworo ◽  
Annizah Rahmatya Gerhana ◽  
Noor Hanifah Angga Putra
Keyword(s):  
Thermal Annealing ◽  
Produced Water ◽  
Uv Light ◽  
Irradiation Time ◽  
Inversion Method ◽  
Filtration Method ◽  
Low Level ◽  
Membrane Performance ◽  
Wet Phase Inversion ◽  
High Level

Produced water is a wastewater from oil production that must be treated well. Membrane is one alternative of water treatments technology based on filtration method. However, in the use of membrane, there’s no exact optimal variable that influences membrane performance.This underlying research to assess factors that influences membrane performance to obtain optimal condition. Therefore, the objectives of this study are determining the effect of variable process in membrane fabrication and several modification techniques on membrane performance. The membranes were fabricated via dry-wet phase inversion method. The process variables of this experiment are varying the Zeolite concentration by low level 1% weight and 3% weight, UV irradiation time low level 2 minutes and high level 6 minutes, thermal annealing temperature low level 160°C and high level 180°C. The experiment runs were designed using central composite design. From the research that has been perfromed, PES/Zeolit membrane has a higher permeability after being irradiated by UV light and denser pore after heating and the longer of annealing time.

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