@misc{oai:repo.qst.go.jp:00069140,
 author = {Oka, Mitsuaki and Shimo, Michikuni and Tokonami, Shinji and Sorimachi, Atsuyuki and Takahashi, Hiroyuki and Ishikawa, Tetsuo and Yamada, Junya and 下 道國 and 床次 眞司 and 反町 篤行 and 石川 徹夫},
 month = {Oct},
 note = {8th international symposium on the natural radiation environment},
 title = {Measurement of indoor radon-222 and radon-220 concetrations in central Japan},
 year = {2007}
}