Effect of thermal annealing on the maximal apparent etched track lengths of alpha particles in a CR-39 nuclear track detector

Document Type : Original Article

Authors

1 Physics department, Faculty of science

2 physics, Faculty of science, Zagazig university

3 Nuclear Physics Department (Cyclotron Facility), Nuclear Research Centre, Atomic Energy Authority

Abstract

In this paper, Poly allyl Diglycol Carbonate (PADC) Polymer-Based Nuclear Track Detector Measurement of Maximum Apparent Track Length of Alpha Particles in NTDs, its brand name is CR-39, has been performed. We determined the etching length of alpha particles from minimum to maximum in an unheat-treated (pristine) and heat-treated CR-39 detector before and after the over-etch zones. The etched alpha track diameter of unheat-treated and heat-treated CR-39 detectors was calculated as a function of etching time at different annealing times and temperatures, using a 241Am as a radioactive source. the energy delivered by the source is 5 MeV which reduced by 0.486 MeV because of 3mm collimator from 5.486 MeV. The resulting minimum and maximum etching lengths for alpha particles in the heat-treated CR-39 detector were smaller than the expected etching lengths, especially at higher annealing temperatures and times. These results are also revealed that the thermally treated CR-39 detectors are insensitive to visualize the real track range of alpha particles at the higher the annealing times and temperatures. The measurements of maximum etched alpha-particle track length are clearly confirmed that the changes brought to the material by heat treatment are chemical in nature not physical, and that these changes significantly alter the measured parameters.

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