Acknowledgement
We are grateful to Professor Mosung Lee in Cheongju University for providing granite stone samples and to Professor Seung Yeon Cho and Dr. Dong Wook Cha in the Indoor Air Quality Control Laboratory of Yonsei University for giving chances to use RN-1025 radon source. We also thank to KAIST Institute for IT Convergence, KAIST for providing equipment and space for this study.
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