@inproceedings{oai:repo.qst.go.jp:00053812,
 author = {Iwaoka, Kazuki and Tokonami, Shinji and Ishikawa, Tetsuo and Kobayashi, Yosuke and Takahashi, Hiroyuki and Yatabe, Yoshinori and Yonehara, Hidenori and Doi, Masahiro and 岩岡 和輝 and 床次 眞司 and 石川 徹夫 and 小林 羊佐 and 谷田部 慶憲 and 米原 英典 and 土居 雅広},
 book = {Proceedings of the Asian and Oceanic Congress for Radiation Protection},
 month = {Oct},
 note = {The deposition of radon decay products in each respiratory region can 
increase the lung cancer risk. Therefore, it is necessary to calculate the 
deposition of radon decay products in respiratory regions. Nowadays, the 
deposition in each respiratory region is able to be imitated using wire 
screens in many studies. Those studies employed grab sampling, that is, 
sampling for short period less than several minutes. In natural environment, 
because the concentration of radon decay products changes with time, it is 
necessary to measure continuously. In this study continuous dosimeter (CD) 
that imitates deposition of radon decay products in respiratory regions by 
using wire screens was developed for the purpose of estimation of the 
deposition in respiratory regions in various environments. The ratio of 
activities deposited in the simulated N and TB regions was calculated from 
results of measurement by CD-R, CD-N and CD-TB continuously, so that after 
aerosols were injected into the radon chamber, the ratio of N and TB 
depositions decreased, and, in addition, N / (N+TB) deposition decreased. 
These results indicated that CD-R, CD-N and CD-TB could measure the change 
of deposition ratio with time.},
 pages = {557--561},
 title = {Development of Continuous Radon Bronchial Dosimeter},
 volume = {4},
 year = {2006}
}