International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2557

Full Length Research Paper

Monitoring of 222Rn/220Rn concentrations at the work places of Muzaffarabad, Azad Kashmir

Bilal Shafique1, Said Rahman2, Muhammad Rafique1* and Saeed Ur Rahman3
  1Department of Physics University of Azad Jammu and Kashmir Muzaffarbad, 13100, Azad Kashmir, Pakistan. 2SPAS Dte. SUPARCO HQs P. O. Box 8402, Pakistan. 3Department of Medical Physics, Nuclear Medicine, Oncology and Radiotherapy Institute, Islamabad, Pakistan.
Email: [email protected], [email protected], [email protected]

  •  Accepted: 18 September 2012
  •  Published: 30 October 2012



Thoron (220Rn), due to its-short half-life of 55.5 s is unable to travel far from its point of generation. A number of studies report indoor radon (222Rn) concentration in different locations of Azad Jammu and Kashmir, while no study reports indoor 220Rn concentration. The CR-39 based passive alpha track detectors were used for the measurement of 222Rn and 220Rn concentrations at different selected workplaces of Muzaffarabad. 222Rn and220Rn concentration were measured simultaneously. Alpha track detectors (ATD) were enclosed in a thin polyethylene film to exclude 220Rn (closed detector) while the other ATD has a coarse metal grid and cloth covering the large entry port allowing for rapid radon gas ingress. The results showed that the measured 222Rn concentration varied from 18.7 Bqm-3 to 160.2 Bqm-3 with an average value of 67.0 ± 3 Bq.m-3. Whereas the 220Rn concentration varied from 14.7 Bqm-3 to 100.4 Bqm-3 with an average value of 50.0 ± 2 Bqm-3. Preliminary results show that indoor 220Rn concentration is significantly higher and should be taken into consideration while calculating the dose due to radiation of natural origin.


Key words: Thoron, indoor radon, alpha track detectors, radiation dose, Azad Jammu and Kashmir.