@article{oai:repo.qst.go.jp:00075831,
 author = {Wakabayashi, Akiko and Yasuoka, Yumi and Janik, Miroslaw and Nagahama, Hiroyuki and Fukuhori, Nobutoshi and Mori, Yasunori and Arai, Yuria and Fujii, Satomi and Mukai, Takahiro and Janik, Miroslaw},
 journal = {RADIOISOTOPES},
 month = {May},
 note = {Radon collectors (e.g., PicoRad collectors) based on activated-charcoal have been used for screening and measuring radon. However, researchers at the U. S. Environmental Protection Agency reported that they could not verify the proper functioning of some commercially available radon detectors, including PicoRad collectors. In this study, we exposed two lots (with different expiration dates) of PicoRad collectors to the reference conditions at a controlled radon concentration within a radon chamber because the calibration factors were derived for use by a semi-empirical equation. Further, we exposed the PicoRad collectors to an uncontrolled radon atmosphere for conducting validity evaluation. The radon concentration results obtained by the Pico-Rad collectors using the semi-empirical equation were observed to be in good agreement with the conventional true radon concentration value. It denoted the optimal value of a quantity determined using a reference instrument. These experiments revealed that different values were required for the factors of the conversion equation of each radon collector lot with a different expiration date.},
 pages = {317--329},
 title = {Derivation and Validity Evaluation of Calibration Factors for Activated-charcoal Radon Collectors},
 volume = {68},
 year = {2019}
}