Oxygen-Effect in Annealing of Recoil Damage in Cobalt Chelates-Tris-Acetyl-Acetone Co(III) and Bis-Salicylaldehyde Triethylenetetramine Co(III) Chloride
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Amar Nath
Summary
A marked 'oxygen effect' is observed for several cobalt complexes in thermal annealing. Kinetic data are reported for recoil damage, after 59Co (γ, n)58Co and 59Co (n,γ) 60Co- reactions in trisacetylacetone Co (III) and bis-salicylaldehyde triethylenetetramine Co (III) chloride respectively. When the thermal treatment is carried out in N2 or vacuum (viz., in absence of oxygen), the magnitude of Saturation anneal is considerably higher. Aliquots annealed to Saturation in presence of air can be made to undergo further annealing, if the thermal treatment is continued at the same temperature but in the absence of air (in vacuum or nitrogen).
It is suggested that during an isothermal annealing run electrons are released from variable depth traps, and interact with the metastable species (damage centres) formed by virtue of interaction of recoil cobalt atom with a chelate molecule. The adsorbed oxygen on the surface acts as deep electron trap and suppresses annealing. Once it is displaced by N2 (or vacuum), annealing proceeds further. The adsorbed oxygen is not found to affect the percentage contribution from individual rate processes (corresponding to different trapping centres) to an equal extent. This shows that the spatial distribution of different trapping centres in the bulk is not homogeneous.
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Artikel in diesem Heft
- Notiz zum Zerfall des 77As
- Fission of 232Th by Reactor Neutrons: Fission Yields of some Mass-Chains
- The Extraction of Thorium from Nitric Acid Solutions by a Quaternary Ammonium Nitrate (Aliquat-336)
- Preparation of Carrier-free 228Ac (MsTh2).
- Contribution à l’étude des complexes sulfuriques du plutonium (IV)
- Effects of Neutron Irradiation on Bromobenzene and some of its Derivatives
- Oxygen-Effect in Annealing of Recoil Damage in Cobalt Chelates-Tris-Acetyl-Acetone Co(III) and Bis-Salicylaldehyde Triethylenetetramine Co(III) Chloride
- Le recuit thermique du coupferronate de fer irradié par neutrons
- The Mechanism of Molecule-Formation by Nuclear Fission and Subsequent Processes in Solid Mixtures
- Formes chimiques de l’azote 16 produit par la réaction 16O (n, p) dans l’eau
- The Identification of Trace Quantities of Radioactive lodine Compounds by Gas-Chromatographic and Effusion Methods
- A Radiotracer Study of Gold Adsorption on Glass from very Dilute Aqueous Solutions
- Graphical Representation of Double Neutron Capture in Gold and Tantalum
- Kurze Mitteilungen
- The Preparation of High Specific Activity Copper 64
- Preparation of Carrier-free Rhodium from Irradiated Palladium
Artikel in diesem Heft
- Notiz zum Zerfall des 77As
- Fission of 232Th by Reactor Neutrons: Fission Yields of some Mass-Chains
- The Extraction of Thorium from Nitric Acid Solutions by a Quaternary Ammonium Nitrate (Aliquat-336)
- Preparation of Carrier-free 228Ac (MsTh2).
- Contribution à l’étude des complexes sulfuriques du plutonium (IV)
- Effects of Neutron Irradiation on Bromobenzene and some of its Derivatives
- Oxygen-Effect in Annealing of Recoil Damage in Cobalt Chelates-Tris-Acetyl-Acetone Co(III) and Bis-Salicylaldehyde Triethylenetetramine Co(III) Chloride
- Le recuit thermique du coupferronate de fer irradié par neutrons
- The Mechanism of Molecule-Formation by Nuclear Fission and Subsequent Processes in Solid Mixtures
- Formes chimiques de l’azote 16 produit par la réaction 16O (n, p) dans l’eau
- The Identification of Trace Quantities of Radioactive lodine Compounds by Gas-Chromatographic and Effusion Methods
- A Radiotracer Study of Gold Adsorption on Glass from very Dilute Aqueous Solutions
- Graphical Representation of Double Neutron Capture in Gold and Tantalum
- Kurze Mitteilungen
- The Preparation of High Specific Activity Copper 64
- Preparation of Carrier-free Rhodium from Irradiated Palladium
