High-LET Pulse Radiolysis: O 2 - and Oxygen Production in Tracks

1978 ◽  
Vol 75 (3) ◽  
pp. 519 ◽  
Author(s):  
Myran C. Sauer ◽  
Klaus H. Schmidt ◽  
Charles D. Jonah ◽  
Conrad A. Naleway ◽  
Edwin J. Hart
Keyword(s):  
Pulse Radiolysis ◽  
Oxygen Production ◽  
High Let

Production de radicaux superoxydes par radiolyse pulsée de l'eau à transfert d'énergie linéique (TEL) élevé

2001 ◽  
Vol 79 (2) ◽  
pp. 180-183 ◽  
Author(s):  
G Baldacchino ◽  
V Trupin-Wasselin ◽  
S Bouffard ◽  
E Balanzat ◽  
M Gardès-Albert ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Heavy Ions ◽  
Pulse Radiolysis ◽  
Direct Methods ◽  
Superoxide Anions ◽  
Radical Species ◽  
High Let ◽  
High Linear Energy Transfer

The radiolysis of water with heavy ions of high linear energy transfer (LET) (-dE/dx) is characterized, in deaerated medium, by the production of superoxide anions, the radiolytic yields of which increase with the LET. Radiobiological interest in such radical species comes from the oxidative stress which may be generated by their dismutation in O2 and H2O2 in anoxic medium (radiotherapy with heavy ions). A brief review of the measurements of superoxide free radicals in aqueous solution by indirect or direct methods is presented. Moreover, some experimental results obtained by pulse radiolysis with Ar18+ ions (TEL = 290 keV·µm-1), are described. The interpretation of the kinetics takes into account the superoxide absorbance and that of hydrogen peroxide, which is present at the millisecond time scale.Key words: pulse radiolysis, heavy ions, superoxide radicals, high LET, kinetics.[Traduit par la Rédaction]

High-LET Ion Radiolysis of Water: Oxygen Production in Tracks

2009 ◽  
Vol 171 (3) ◽  
pp. 379-386 ◽  
Author(s):  
Jintana Meesungnoen ◽  
Jean-Paul Jay-Gerin
Keyword(s):  
Oxygen Production ◽  
Water Oxygen ◽  
High Let

A New Method for the Measurement of Low Concentrations of OH/O2-Radical Species in Water by High-LET Pulse Radiolysis. A Time-Resolved Chemiluminescence Study

2000 ◽  
Vol 104 (38) ◽  
pp. 8709-8714 ◽  
Author(s):  
V. Wasselin-Trupin ◽  
G. Baldacchino ◽  
S. Bouffard ◽  
E. Balanzat ◽  
M. Gardès-Albert ◽  
...  
Keyword(s):  
Pulse Radiolysis ◽  
New Method ◽  
Radical Species ◽  
Time Resolved ◽  
Low Concentrations ◽  
High Let

Pulse radiolysis of polymers in aqueous solution. Kinetics study

1997 ◽  
Vol 94 ◽  
pp. 244-250 ◽  
Author(s):  
I Janik ◽  
P Kujawa ◽  
P Ulanski ◽  
JM Rosiak
Keyword(s):  
Aqueous Solution ◽  
Pulse Radiolysis ◽  
Kinetics Study ◽  
Solution Kinetics

A Laser Flash Photolysis and Pulse Radiolysis Study of Primary Photochemical Processes of Flumequine¶

2000 ◽  
Vol 72 (4) ◽  
pp. 451 ◽  
Author(s):  
M. Bazin ◽  
F. Bosca ◽  
M. L. Marin ◽  
M. A. Miranda ◽  
L. K. Patterson ◽  
...  
Keyword(s):  
Pulse Radiolysis ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Photochemical Processes

Phanerozoic Oxygen

2017 ◽  
Author(s):  
Donald Eugene Canfield
Keyword(s):  
Oxygen Consumption ◽  
Organic Carbon ◽  
Sea Level ◽  
Time Scale ◽  
Atmospheric Oxygen ◽  
Sea Level Change ◽  
Oxygen Production ◽  
Level Change ◽  
History Of ◽  
Geologic Processes

This chapter discusses the modeling of the history of atmospheric oxygen. The most recently deposited sediments will also be the most prone to weathering through processes like sea-level change or uplift of the land. Thus, through rapid recycling, high rates of oxygen production through the burial of organic-rich sediments will quickly lead to high rates of oxygen consumption through the exposure of these organic-rich sediments to weathering. From a modeling perspective, rapid recycling helps to dampen oxygen changes. This is important because the fluxes of oxygen through the atmosphere during organic carbon and pyrite burial, and by weathering, are huge compared to the relatively small amounts of oxygen in the atmosphere. Thus, all of the oxygen in the present atmosphere is cycled through geologic processes of oxygen liberation (organic carbon and pyrite burial) and consumption (weathering) on a time scale of about 2 to 3 million years.

Recent developments of the Carbotek process for lunar oxygen production

1992 ◽  
Author(s):  
CHRISTIAN KNUDSEN ◽  
MICHAEL GIBSON ◽  
DAVID BRUENEMAN ◽  
SEISHI SUZUKI ◽  
TETSUJI YOSHIDA ◽  
...  
Keyword(s):  
Oxygen Production ◽  
Recent Developments
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