Étude par spectrométrie d'absorption infrarouge des dommages produits par des photons γ et des ions lourds sur un triacétate de cellulose

Our earlier results on ασ and heavy‐ion‐radiation damage in cellulose triacetate (CTA) are compared with those of previous authors on UV‐and γ‐radiation damage in the same material. Thus the common effects of these different methods of irradiation can be distinguished from those characteristic of the radiation employed. With heavy‐ion radiation the production of stable radicals is accompanied by C—O cleavage. In the case of 3684Kr (1 MeV/amu) ions, the number of free radicals produced is investigated, without distinguishing the species, by using the scavenger technique in the solid phase, combined with UV spectroscopy. On the other hand, C—O cleavage is observed by IR spectroscopy, with its inherent selectivity. A statistical study shows that the experimental curves representative of the evolution of the optical transmittance ratio before and after irradiation L(N) versus the ion fluence N are of exponential type: where β is a parameter related to the volume damaged by a single ion and, therefore, to the latent track size. The latter is approximated by a cylinder whose height is equal to the range of the ion. For 3684Kr8+ (1.1 MeV/amu) the track length is 21 μ. For each type, damages are localized within a radius of 250 Å for free‐radical yields, 148 Å for cellulosic chain cleavages, 108 Å for deacetylation, and 100 Å for opening of pyrannosic rings. The track length is 14 μ for 1735Cl6+ (1 MeV/amu), while the radius of the cylinder in which free radicals are produced is only 80 Å.

show abstract

Distribution spatiale des dommages produits par les ions Kr (1 MeV/amu) et Cl (1 MeV/amu) dans le triacétate de cellulose

Moliton

Boutinaud

Decossas

et al. 1982

J. Polym. Sci. Polym. Phys. Ed.

View full text Add to dashboard Cite

show abstract

Etude cinétique des effets de fluence énergétique, de débit de fluence, et d'effacement induits par des ions lourds et des photons γ dans le triacétate de cellulose

Moliton¹,

Boutinaud²,

Vareille³

et al. 1982

J. Polym. Sci. Polym. Phys. Ed.

View full text Add to dashboard Cite

The kinetic interpretation of the damage produced by heavy ions ( 3684Kr and 1735Cl from 1 MeV/amu) and γ radiation in cellulose triacetate leads to an exponential dependence on the ion fluence. A comparison of the fading effect produced by heavy ions and γ rays shows that the heavy ions, unlike γ rays, cause irreversible damage. Finally, a nonlinear dependence on the flux of ions and γ rays is found in the kinetics of radiation damage. This result is contrary to the usual assumption that heavy‐ion flux, like γ‐ray flux, is additive, at least for the fluxes of 109−2 × 1010 ions/cm2s and dose rates of 103–104 Gy/h used in this work.

show abstract

Enregistrement des traces de protons dans des detecteurs de type cellulosique

Decossas

Vareille

Moliton

et al. 1980

Nuclear Instruments and Methods

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Étude par spectrométrie d'absorption infrarouge des dommages produits par des photons γ et des ions lourds sur un triacétate de cellulose

Cited by 5 publications

References 3 publications

Distribution spatiale des dommages produits par les ions Kr (1 MeV/amu) et Cl (1 MeV/amu) dans le triacétate de cellulose

Distribution spatiale des dommages produits par les ions Kr (1 MeV/amu) et Cl (1 MeV/amu) dans le triacétate de cellulose

Etude cinétique des effets de fluence énergétique, de débit de fluence, et d'effacement induits par des ions lourds et des photons γ dans le triacétate de cellulose

Enregistrement des traces de protons dans des detecteurs de type cellulosique

Contact Info

Product

Resources

About