@misc{oai:repo.qst.go.jp:00067858,
 author = {Ishikawa, Tetsuo and Tokonami, Shinji and et.al and 石川 徹夫 and 床次 眞司},
 month = {Sep},
 note = {6th Internatioanal Conference on High levels of Natural Radiatioan and Radon Areas},
 title = {An intercomparison exercise for thoron gas measurement},
 year = {2004}
}