Development of Continuous Radon Bronchial Dosimeter

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.

書誌情報

Proceedings of the Asian and Oceanic Congress for Radiation Protection

巻 4, p. 557-561, 発行日 2006-10

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