Investigation of the effect of he-ne laser on the optical properties through etched CN-85 and CR-39 containing Alpha tracks

Abstract EN

The effects of He-Ne laser on the optical characteristics of Cellulose nitrate, CN-85, and Poly allyl diglycole carbonate, CR-39, nuclear track detectors have been studied by using photoluminescence (PL) and UV-visible spectroscopic techniques.

The polymers irradiated with alpha particles with close contact to 241Am and then exposed to He-Ne laser with different doses.

The laser energy intensities ranged between 0 and 217 J/cm2.

The change in the PL spectra may be explained by chain conformational disorders as well as chain scission.

From the UV-visible spectra, it is found that a shift in the absorption edge towards a longer wavelength with increasing laser doses can be readily observed.

The absorption peak with increasing dose is seen to change into a broad one.

The optical band gaps determined from the UV-visible spectra were found to decrease with the increase of energy intensities of He-Ne laser.

These results have been explained on the basis of scission of the polymers due to laser irradiation.

The UV absorption tail formation in both polymers was related to the diminution of optical band gap.

Results show good correlation with the applied doses.