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Yields of $CO_2$ formation and scissions at ether bonds along nuclear tracks in CR-39

Abstract : Yields of $CO_2$ gas formation and the scissions at ether bonds have been determined along ion tracks in CR-39 plastics. Thin CR-39 films with 15 $\mum$ thickness were irradiated by 130 MeV C-13 ions at 45\degres incidence up to $10{13}$ ions/cm$^2$, and then IR spectra were obtained without removing the samples from the vacuum chamber. The absorption band for $CO_2$ was observed clearly around 2338 cm$^{-1}$, whose absorbance increased proportional to the fluence up to $3\times10^{12}$ ions/cm$^2$ and then saturated. Using a mole absorption coefficient for gaseous $CO_2$, the yield along the track was determined to be 7200 $CO_2$ molecules/$\mum$. This means that the $G$-value of $CO_2$ formation in CR-39 was about 3.6 molecules/100 eV. The scission yield of ether bonds was found to be 11,000 scissions/$\mum$. This corresponds to a $G$-value of about 5.5 scissions/100 eV. These values suggest that the parts between the two carbonate ester bonds in each repeat unit of CR-39 can be segmented into two $CO_2$ and other small molecules along the nuclear tracks.
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Contributor : Dominique Girod <>
Submitted on : Tuesday, December 13, 2005 - 2:05:23 PM
Last modification on : Thursday, April 23, 2020 - 2:26:21 PM

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T. Yamauchi, R. Barillon, E. Balanzat, T. Asuka, K. Izumi, et al.. Yields of $CO_2$ formation and scissions at ether bonds along nuclear tracks in CR-39. 22nd International Conference on Nuclear Tracks in Solids, Aug 2004, Barcelone, Spain. pp.224-228, ⟨10.1016/j.radmeas.2005.05.013⟩. ⟨in2p3-00025222⟩



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