Indian Journal of Physics

, Volume 83, Issue 6, pp 751–757 | Cite as

Factors affecting the registration and counting of alpha tracks in solid state nuclear track detectors

  • K. P. Eappen
  • Y. S. Mayya


In view of the fact that the radon progeny contribute the highest to the natural radiation dose to general populations, large scale and long-term measurements of radon and its progeny in the houses have been receiving considerable attention. Solid State Nuclear Track Detector (SSNTD) based systems, being the best suited for large scale passive monitoring, have been widely used for the radon gas (using a cup closed with a semi-permeable membrane) and to a limited extent, for the measurement of radon progeny (using bare mode in conjunction with the cup). These have been employed for radon mapping and indoor radon epidemiological studies with good results. In this technique, alpha tracks recorded on SSNTD films are converted to radon/thoron concentrations using corresponding conversion factors obtained from calibration experiments carried out in controlled environments.

The detector response to alpha particles depends mainly on the registration efficiency of the alpha tracks on the detector films and the subsequent counting efficiency. While the former depends on the exposure design, the latter depends on the protocols followed for developing and counting of the tracks. The paper discusses on parameters like etchant temperature, stirring of the etchant and duration of etching and their influence on the etching rates on LR-115 films. Concept of break down thickness of the SSNTD film in spark counting technique is discussed with experimental results. Error estimates on measurement results as a function of background tracks of the films are also discussed in the paper.


Alpha tracks radon progeny SSNTD 


07.89.+b 07.57.Kp 29.40.-n 


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  1. [1]
    D A Yung Nature 182 365 (1958)CrossRefADSGoogle Scholar
  2. [2]
    R L Feischer, P B Price and R M Walker Nuclear Tracks in Solids (Berkley: Univ. of California Press) (1975)Google Scholar
  3. [3]
    M Fujii, R Yokota, Y Atarashi and H Hasegawa Radiat. Meas. 19 171 (1991)Google Scholar
  4. [4]
    T A Gruhn, W K Li, E V Benton, R M Cassou and C S Johnson in Proceedings of the 10 Conference on SSNTD, Lyon 291 (1979)Google Scholar
  5. [5]
    W Enge, K Grabisch, Beaujean and K P Bartholma Nucl. Instr. and Meth. 115 263 (1974)CrossRefADSGoogle Scholar
  6. [6]
    C W Y Yip, J P Y Ho, V S Y Koo, D Nikezic and K N Yu Radiat. Meas. 37 19 (2003)CrossRefGoogle Scholar
  7. [7]
    M Siems, K Freyer, H-C Treutler, G Jonsson and W Enge Radiat. Meas. 34 81 (2001)CrossRefGoogle Scholar
  8. [8]
    G Jonsson Nucl. Instr. and Methods 190 407 (1981)CrossRefADSGoogle Scholar
  9. [9]
    G Somogyi Nucl. Instrum. Meth. 173 21 (1980)CrossRefADSGoogle Scholar
  10. [10]
    R Andriamanantena and W Enge Radiat. Meas. 25 625 (1995)CrossRefGoogle Scholar
  11. [11]
    W G Cross and L Tommasino Radiat. Effects 5 85 (1970)CrossRefGoogle Scholar
  12. [12]
    K P Eappen and Y S Mayya Radiat. Meas. 38 5 (2004)CrossRefGoogle Scholar

Copyright information

© Indian Association for the Cultivation of Science 2009

Authors and Affiliations

  1. 1.Environmental Assessment DivisionBhabha Atomic Research CentreMumbaiIndia

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