An evaluation of radial track etch rate in LR-115 detectors exposed to Fe ions by means of FT-IR spectrometry

Chemical modification of LR-115 induced by the irradiation of gamma-ray and 147 MeV Fe ions has been observed. Density of O–NO2NO2 and C–O–C bonds in the sheets was decreased. We also confirmed the modification by chemical etching during early stage in LR-115 exposed to Fe ions. The absorption band around 1740cm-1 was reduced rapidly, which can be attributable to COCO bonds of some additives contained in LR-115. We have derived the radial track etch rate from the reduction of the absorbance.