Bulk-etch rate of CR-39 detector under various conditions of temperature and concentration of NaOH solution.

概要

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Bulk-etch rate (VB) is one of the most fundamental characteristics in solid state nuclear track detector (SSNTD). For CR-39, a new important SSNTD, the VB was measured by changing the concentration of NaOH solution from 10 to 30% and the etching temperature from 50 to 70°C. The amount removed by etching was determined by measuring the thickness of detector before and after etching with a micrometer. The detector absorbed water and subsequently swelled. A way to remove the water was obtained, which raised the reliability in the measurements. The VB was found to be constant during etching and 1.18×1010 exp (0.122×C)·exp(-8.74×103.1/T) (μm/h), where C and T are the concentration (%) and the temperature (°K) of etchant respectively. The activation energy was calculated and found to be 0.75eV.
日本保健物理学会の論文