إيجاد معدل القشط العام لكاشف الأثر النووي CR-39 بإستخدام طريقة Le-D

الملخص EN

The bulk etch rate (VB) and the track etch rate (VT) are important parameters in identifying the track profiles and their growing rate.

The aim of this paper is to determine the bulk etch rate of CR-39 detector using the track's diameter-length (Le-D) measurement method by irradiating the detector with different energies of alpha particles from 241Am source.

Different normalities of the chemical solution NaOH at a temperature of (70±1) oC are used in etching the detectors to measure the track's lengths and diameters at different etching times corresponding to the energy of the incident particles and the etchant normality.

The paper also aims to find the bulk etch rate by using the method of direct measurement of the removed layer thickness from the detector surface through alternating etching processes using normalities of (5.5-8) N.

It is necessary to mention here that this method does not require to irradiate the detector with alpha particles.

The bulk etch rate (VB) values of CR-39 detector found by Le-D method were (1.137-1.919) m.hr-1 at normalities of (5.5-7.5) N.

They showed good agreement with the values measured by the removed layer method which were (0.944-1.831) m.hr-1 , and they also showed good agreement with other values which resulted by Gruhn et al.

for the same normalities.

The VB measured by Le-D method also showed good agreement with the fitting curve produced by fitting the experimental results of both methods, which showed VB between (1.0418-1.845) m.hr-1 for the same normalities, in addition to good agreement with results of other studies using different methods.