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This is to certify that your paper entitled «Predicting the values of radon gas and evaluation of different interpolation methods to find the best distribution of radon gas(Case study: Tehran metropolis)» was indexed with 11 pages, in the CIVILICA citation database, code COI:ATTITTDE01_247, after evaluation and approval of the referees of the "First International Congress on Earth, Space and Clean Energy held in Ardabil 2015.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.