@article{oai:nagoya.repo.nii.ac.jp:00031192,
 author = {Kawano, Minoru and Ikebe, Yukimasa and Nakashima, Yoshiyuki and Nakayama, Takeyoshi and Shimo, Michikuni and Minato, Susumu and Iida, Takao},
 issue = {2},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Mar},
 note = {This paper consists of two parts. Chapter 1 is concerned with the results of measurements of ionization intensities due to the beta- and gamma-radiations near the ground carried out from 1963 through 1969. The influences of fallout radioactivity deposited on the ground surface were studied from the view point of atmospheric ionization. The beta-radiation from the fallout radioactive nuclides deposited on the ground surface decreased remarkably during the last 6 years, and recently, a newly designed ionization chamber made of platic plates was used for meauring the beta-radiation. The ionization intensity due to the gamma-radiation didn't change so remarkable as that due to the beta-radiation during the same period. Recently, spectroscopic method with N2I scintllation counter was adopted for obtaining some detailed informations on the terrestrial gamma-radiation. In the beginning of January 1967, sudden increases of the ionization intensities due to the beta- and gamma- radiations from the fallout radioactivity caused by a nuclear explosion test were measured. Chapter 2 is concerned with the physical properties of RaA ion. To clarify the interaction between RaA ions and condensation nuclei, simultaneous measurements of the concentrations of RaA ions (nA), radon-222, condensation nuclei (Z) and the diffusion coefficient of condensation nuclei (D) were carried out. It was found that the correlation among them may be well expressed by the simple formula : qA = βAnAZ. The correlation between βA and D (or rdius of nuclei) was also obtained. The effective attachment coefficient of RaA ions was compared with that of small ordinary ions, and it was presumed that about 25 per cents of RaA atoms formed on the decay of radon-222 seem to have some charge, and remaining 75 per cents have no charge.},
 pages = {250--272},
 title = {Some properties of ionizing radiations and radioactive ions in the natural environment},
 volume = {21},
 year = {1970}
}