Estimate of etched tracks by optical method and spark counting

Rajesh Kumar, K. P. Eappen, A. K. Shukla, R. M. Tripathi, V. D. Puranik

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Solid State Nuclear Track Detectors (SSNTD) are commonly used for long term measurements of radon, thoron and progeny concentrations. In the present study, we compared the optical counting method and the spark counting technique for counting the alpha tracks on LR 115 track detector films. The paper discusses the various parameters that are innate in the process. More than 300 films were counted by both optical microscope and spark counter and the results are compared. The overall results show that the tracks obtained by spark counting are marginally less compared to the optical measurement. A linear fit of the data gives a slope less that one, which indicates that both the methods are almost in good agreement for counting the tracks when the track density is low. At higher track densities the spark counter gives an underestimation with respect to actual number of tracks formed, which could be corrected using a relation obtained between the tracks measured by optical method and spark counting.

Original languageEnglish
Pages (from-to)839-844
Number of pages6
JournalIndian Journal of Physics
Issue number6
StatePublished - Jun 2009
Externally publishedYes


  • LR 115
  • Radon
  • Spark counter


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