Determination of a Critical Angle (θc) for Track Revelation for Different CR-39 Nuclear Track Detector Materials


  • Asaad H. Ismail College of Science Education, Salahaddin University, Erbil, Kurdistan Region, Iraq. Author



CR-39 detectors, TRACK_TEST program, Critical angle, Detector efficiency


Different thicknesses of 50 samples of commercially CR-39 Solid State Nuclear Track Detectors (SSNTDs) have been prepared with different ages and from different produced companies. Track parameters and plotting profiles, using computer program TRACK_TEST ware calculated. Detector efficiency has been found to be depends strongly on the critical angle for track revelation (C). On the other hand, critical angle depends strongly on the bulk etch rate.The results were specified that the detectors older than 3 years seemed to show odd behaviors of VB with detector efficiency. For age=3years the efficiency decreases exponentially for different alpha particle energy, and the bulk etch rate (VB ) increases with decreasing age. This behavior may be important in applications of this detector; for example, the calibration factor for radon measurements should be established by taking into account the age of the detector.


- Young D.A. Fundamental of solid materials. Nature. 1958. 182(375)..112-16 DOI:

-Durrani S.A., Bull R.K . Solid State Nuclear Track Detection, Principles, Methods and Applications ,1987, Pergamon Press, 5-20.

-Nikezica, D. Yub, K.N. Formation and growth of tracks in nuclear track materials. Materials Science and Engineering. 2004. R46. 51–123. DOI:

-Asaad H. Ismail. “Study of Indoor Thoron Levels and Its Hazards inside Kindergartens in Iraqi Kurdistan Using CR-39 Nuclear Track Detectors”, Proceedings of 2nd Environmental physics conference, Feb. 18-22, 2006, Alexandria, Egypt

-Durrani S.A. Ilic R., Radon Measurements by Etched Track Detectors: Applications in Radiation Protection, Earth Sciences and the Environment,1997, World Scientific, Singapore. DOI:

-Chan K.F. Lau B.M.F., Nikezic D. Tse A.K.W., Fong W.F. and Yu K.N. Simple preparation of thin CR-39 detectors for alpha –particle radiological experiments, Nucl. Inst. Methods in Physics research B . 2007, 263. 290-293. DOI:

-Somogyi G., Development of etched nuclear tracks, Nucl. Instr. Methods. 1980 173. 21–42. DOI:

- Fromm M., Chambaudet A., Membrey F., Data bank for alpha particle tracks in CR39 with energies ranging from 0.5 to 5 MeV recording for various incident angles, Nucl. Tracks Radiat. Meas. 1988, 15, 115–118. DOI:

- Fews A.P., Henshaw D.L., High resolution alpha spectroscopy using CR- 39 plastic track detector, Nucl. Instr. Methods. 1982,197, 517–529. DOI:

-Dörschel B., Hermsdorf D. and Reichelt U. Radiation Measurements. 2002, 35(3), 189-193. DOI:

-Nikezic D., Yu, K.N.", Computer program TRACK_TEST for calculation parameters and plotting profiles for etch pits in nuclear track materials", Computer Physics Communication.. 2006. 174, 160-165. DOI:

-Shahid M., Improvements and Calibrations of Nuclear Track Detectors for Rare Particle Searches and Fragmentation, 2007,PhD. Thesis, University of Bologna, Bologna, Italy.

-Asaad H. Ismail, Measurement of Radon activity concentration in Iraqi-Kurdistan soil gas by using CR-39 nuclear track detectors, 2004, M.Sc. Thesis, University of Salahaddin, Erbil- Iraqi .

-Fujii M. Yokota R., Atarashi Y., H. Hasegawa, Radiation measurement. 1991. 19. 171 DOI:

-Hardcastle G.D. and Miles J.C.H., Ageing and Fading particle Tracks in CR-39 Exposed to Air, Radiation Protection Dosimetry, 1996., 67. 295-298. DOI:



How to Cite

Determination of a Critical Angle (θc) for Track Revelation for Different CR-39 Nuclear Track Detector Materials. (2009). Journal of Zankoy Sulaimani - Part A, 12(1), 109-118.

Most read articles by the same author(s)

1 2 3 4 5 6 7 8 9 10 > >>