@article{oai:jaxa.repo.nii.ac.jp:00022582,
 author = {Maki, Syou and Honma, Yoshiyuki and Tsuchiya, Hidetoshi and Tanaka, Kazunari and Aoki, Shigeru and Takeoka, Hajime and Miki, Takeo and Ohshima, Hiroshi and Yamamoto, Masafumi and Morimoto, Yasuo and Ogawa, Yasutaka and Mukai, Chiaki},
 issue = {1},
 journal = {Biomedical Soft Computing and Human Sciences},
 month = {Jul},
 note = {In order to investigate the behavior of suspended particle matter (SPM) in a 1/6 gravity
(1/6 G) environment, simulated lunar regolith was diffused in a chamber, realizing a quasi 1/6
gravity environment by parabolic flight. The effect of the 1/6 G environment on the atmospheric
suspension was evaluated by means of the cutoff value of an elutriator; the cutoff value in the 1/6 G
should be 6 times larger than at the earth’s surface. The results of our experiment confirmed that
the falling velocity of SPM in a 1/6G approximates Stokes’ law, and the falling time is inversely
proportional to the force of gravity. Numerical computation suggested that residual SPM in a
convection-free room becomes high in a low-gravity environment or in a high-ceilinged room. These
results suggest that once lunar dust intruded into a lunar base, it would take a considerably long
time to clean up. Since the suspension time of SPM is different according to the particle size, the
exposure risk of SPM will also vary according to the particle size. Considering that the risk depends
only on the drifting time, the actual influence of low gravity on fine particles (Dp ???? 1.0 mm in
diameter) and on large particles (Dp > 10 mm) in a 1/6G would be negligible. In contrast, for
medium sized particles (2.5 < Dp ???? 10 mm) the difference in the drifting time between that on the
earth and on the lunar surface is much larger than can be confirmed with the senses. Safety
precautions used for this size of particle on the earth should be altered on the lunar surface., Accepted: 2015-03-09, 資料番号: PA1510090000},
 pages = {7--19},
 title = {Effect of 1/6 Gravity Environment on Atmospheric Suspension of Simulated Lunar Regolith},
 volume = {20},
 year = {2015}
}