J.L. Teyssier

Contribution to the research on cellulose diacetate as a solid state track detector

Abstract While having a similar composition to Cellulose Triacetate, Cellulose Diacetate is a less sensible heavy ions detector. With a 0.9 N potash etching at 20°C, ions which have higher Z than Carbon are not recorded and the Etch Rate Ratio is about 1 to 2 for Cu and Kr ions. The study of the infrared absorption spectra shows a decrease of the v(O-H) band intensity at 3500 cm−1 for CDA, when it increases for CTA.

Enregistrement des traces de protons dans des detecteurs de type cellulosique

Abstract After a brief summary of main papers on cellulose proton track detectors, the results of our experiments on the subject are given: cellulose nitrate CN 85, from Kodak France, seems to be the best for proton track detection. Its efficiency is 100% from 50 keV up to 760 keV, while the angle of the impinging particle on the detector does not exceed 60°; these results were obtained with etching conditions as follows: KOH 4N, 30°C.

Cellule d'irradiation et d'analyse par spectroscope infrarouge dans le domaine de temperature −160°C a +25°C

Abstract A description is given of a low temperature (−160°C) irradiation cell for a particle accelerator. This cell also allows the study of irradiated samples by infrared spectroscopy at −145°C, without contact with air. It is shown how this device makes possible the study of reactions of the first kind between ions and matter. In the case of solid-state nuclear track detectors, it can thus be understood why cellulose diacetate is a poor detector compared with cellulose triacetate.

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

The kinetic interpretation of the damage produced by heavy ions (Kr and Cl 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.