Inter-comparison of geometrical track parameters and depth dependent track etch rates measured for Li-7 ions in two types of CR-39

Abstract

The depth dependent track etch rates of two types of CR-39, TASTRAK and BARYOTRAK, for Li-7 ions with incident energies of 4.82, 6.75 and 10.77 MeV have been evaluated from track length measurements. The pit lengths versus the etching time obtained by three different laboratories have the same trend, but did not agree completely. These differences can be attributed to an error margin of less than one decimal point in the etching temperature. Significant deviations were also present for the assessed track etch rates. Most of the deviation was attributed to the derivation step of the growth curves. A sufficient amount of data and reasonably smooth growth curves were required near the Bragg peak in order to make a precise estimation.

Investigations of protons passing through the CR-39/PM-355 type of solid state nuclear track detectors

“…Hermsdorf used a V B value of 1.73 ± 0.09 μm/h, the accuracy of which was checked and verified by an international team in laboratories in Germany, France, and Japan. 19,20 The latter values are also higher because of the higher concentration of the NaOH solution relative to ours.…”

Studies on the nuclear tracks in CR-39 plastics

“…In this decade my colleagues and I have been engaged in the study on the latent tracks in CR-39 detector, as well as calibration studies for light ions (Yamauchi et al, 1995a(Yamauchi et al, , b, 1996(Yamauchi et al, , 1997(Yamauchi et al, , 1999b(Yamauchi et al, , 2001b. Our studies on the latent tracks were divided in three parts.…”

A New Treatment to Compute the Track Parameters in PADC Detector using Track Opening Measurement

“…These results agree with those indicated by other works for alpha particles in CR-39, and furthermore, it agrees with Yamauchi et al for alpha particle and 7 Li ion tracks in CR-39 in view of the direct measurement of the track lengths. 17,18,26,28,33 However, the small variance between the values of the saturation time (t sat ) in the Tables 1 and 2, that extracted from zero-valued (dL/dt) o points in the Figure 5 and L max points in the Figure 6, is due to the fitting process of the curves in these figures.…”

“…It appears from the figure that the track length curve consists of two segments. 5,8,11,18,26,28 In the first segment, the track length develops exponentially and gets to maximum and constant value (saturation) when the etching solution reaches the end of the particle range in the detector where the particle range (damaged area) is completely etched. As a result, the track at this stage is called the etched-out track and it is conically shaped with a sharp tip at the end of the particle trajectory in the detector.…”