G. Chacin, L. Sajo-Bohus, J.J. Rojas Hancco and G. Espinosa
Nuclear track density, cr-39 detectors, beam diagnostics, charged particle sources
|PUBLISHED DATE||August 6, 2018|
|PUBLISHER||The Author(s) 2018. This article is published with open access at www.chitkara.edu.in/publications.|
Nuclear track density provides accelerator beam imaging and diagnostic employing CR-39 passive detectors. Counting charged particles related tracks by automated reading systems depend on the accuracy of microscope field view other that chemical etching procedure and frequency of overlapped tracks. The study, to propose a method to determined track density for analyser optical field view not calibrated. The approach Jungs’ theorem, provides the area value based on the maximum distance for two selected etched tracks. Results show that the new method has its importance when microscope field view calibration is not available with precision for accelerator beam diagnostics.
In accelerator beam monitoring employed diagnostic technique by both destructive and non-destructive procedure to determine beam intensity, its longitudinal, transverse shape and size including emittance, perturbative or slightly disturbing and destructive method are employed such as scintillator screen for beam intensity study, to determine beam transverse size, shape and position respect the centre line. An alternative plastic detector is particularly useful for low-beam-current (picoAmp) profile monitoring and are successfully employed in accelerator design development. Passive track detector such as C12H18O7 polymer etched in 6N KOH solution at 60°C for 18h provide images on charged particle as geometrical cones visible under light transmission microscope. The number of tracks per detector area provide trough density (tracks/unit area) information for instance on the accelerator beam imaging and diagnostics; the information on beam intensity is derived from the number of particles observed per unit area and the beam tails parameter from track density gradient . It is then essential to have precise value for microscope field value to determine track density or number of tracks per unit area. Polyallyldiglicol carbonate (PADC) currently under the trade mark CR-39TM play an important role in determining beam parameter for radioisotope production, personal dosimetry  and cancer treatment  among other fields. Since track density provide information on dose transference efficiency i.e. how uniform is both the beam and its spatial dispersion (beam broadening and anisotropy) inside a give volume.
|ISSN||Print : 2321-8649, Online : 2321-9289|