Written in English
|Contributions||Hallett, A. C. H. (supervisor)|
|LC Classifications||LE3 T52 PHD 1966 M378|
|The Physical Object|
|Number of Pages||159|
We present a theory of radiation damage formation in alkali halides based on a new mechanism of dislocation climb, which involves the production of V F centers (self-trapped hole neighboring a cation vacancy) as a result of the absorption of H centers of dislocation lines. We consider the evolution of all experimentally observed extended defects: metal colloids, gas bubbles, and vacancy by: Abstract. A study is undertaken into radiation-induced conductivity of alkali halide crystals under X-ray excitation and sequential excitation with X-ray and laser pulses within the absorption band of F-and F − basic conduction parameters (concentration and lifetime of carriers upon X-ray and photoexcitation) are : V. D. Kulikov, Yu. V. Lisyuk. At K the creation efficiency is especially high in the regions – and – eV where the energy of hot photoelectrons is sufficient for the formation of near-impurity. Interaction between dislocations and radiation‐induced halogen interstitials in KBr doped with alkali impurities has been studied in terms of the thermal‐activation mechanism of dislocation dynamics. Measurements are made on radiation‐induced changes and their thermal recovery of activation volume and flow stress. Temperature dependence of flow stress and activation volume in .
Dissolution of γ-irradiated chlorides of sodium and potassium in a solution of NaNO3 and KI results in the formation of NO 2 − and iodine as stable products. The variation in the yields of the products with the amount of irradiated salts is studied. The effect of photoannealing of the irradiated salts on the yields of nitrate and iodine in the mixture is discussed on the basis of. The property of single halogen interstitials as the hardening agent has been studied through experiments using KBr doped with alkali impurity. Thermal recovery of the radiation‐induced increment of the flow stress Δτ, and the thermal annealing of color centers in KBr: Na and KBr: Li are measured by means of an isochronal pulse‐annealing technique. Radiation-induced H 2 Production M n (Dalton) γ (molec./e V) α (molec./e V) De-aerated 22 k De-aerated 47 k De-aerated 99 k Aerated 22 k Wet & Aerated 22 k . RadiationEffectsDamage - 3 - K. E. Holbert 2. General Radiation Effects The general types of radiation effects on materials can be categorized into (1) Impurity Production, that is, transmutation of nuclei into other nuclei which themselves may be radioactive; this mechanism is caused by neutrons through fission and activation (capture).
excitons and radiation damage in alkali halides Users without a subscription are not able to see the full content. Please, subscribe or login to access all content. Huston DC, Pollard EC. DNA degradation in Escherichia coli 15T-L- induced by fast proton bombardment. Biophys J. Sep; 7 (5)– [PMC free article] Kaplan HS. DNA-strand scission and loss of viability after x irradiation of normal and sensitized bacterial cells. Proc Natl Acad Sci U S A. Jun; 55 (6)– However, this concept is not adequate, at least for the V K center studied by Nadeau (Ref. 3), since the V K center has been shown to have a considerable hardening effect, though the trace of the strain tensor is zero (see Ref. 6). Google Scholar; N. Itoh, B. S. H. Royce, and R. Smoluchowski, Phys. Rev. , A (). Google Scholar. 4 quadruples rate doubles rate k [A] 2[B] 2 1 3 Termolecular The overall order is determined by how many molecules are involved in the rate-determining step. Unimolecular reactions involve only one molecule at the RDS, for example. k, the rate constant, varies depending on the exact conditions. A bigger k gives a faster reaction.