Abstract
The etching characteristics of CR-39 plastic track detector have been studied using various concentrations of KOH and NaOH and with the addition of an alcohol solvent. The bulk etch rate in the pure KOH and NaOH solutions increases in the concentration range 4.5–40%. However the ratio of track etch rate to bulk etch rate has a maximum value around 20% concentration and is dependent on particle ionization. The addition of alcohol solvent to the etchant solution produces a marked increase in bulk etch rate and heavily de-sensitizes the plastic. The use of such solutions enables the track response to be switched off below a given value of ionization. Certain applications where this effect can be exploited are discussed.
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