THE RESULTS OF ROUTINE OBSERVATIONS OF THE IONIZATION AND THE NATURAL RADIOACTIVE DUST CONCENTRATION IN THE ATMOSPHERE, IN TOKYO. (PRELIMINARY REPORT)
Journal Article
·
· Denki Shikensho Iho (Japan) Changed to Denshi Gijutsu Sogo Kenkyusho Iho
OSTI ID:4163772
The ionizations by alpha -, beta -, gamma -rays and by beta -, gamma -rays, and the natural radioactive dust concentration in the atmosphere near the ground were observed continuously at Tanashi, Tokyo, since April 1958. On fine days, the diurnal variation of the ionization by alpha -, beta -, gamma -rays is similar to that of the ionization by beta -, gamma -rays. The maximum value occurs at night (4 to 6 h), and the minimum value occurs in the daytime (11 to 13 h). On cloudy and rainy days, the time variations are very irregular, and the values are considerably larger than those on fine days. On fine days, the values of ( beta , gamma )/( alpha , beta , gamma ) are about 2 to 5 per cent, and is large in the daytime, and small at night; but, the values on cloudy and rainy days are considerably smaller than those on fine days. According to the results of observations with the electrical collector, the natural radioactive dust concentration is large at night and small in the daytime, and the diurnal course is similar to that of ionization. But, the amplitude of the diurnal variation curve of the dust concentration collected by the electrostatic collector is remarkably larger than that of the ionization by beta -, gamma -rays measured by the ionization chamber. The results of simultaneous observations mentioned above are seemed to be important for the researches of the natural radioactivity and the frequency distribution of the particle size of the radioactive dust in the atmosphere. The abnormal increase of the ionization by alpha -, beta -, gamma -rays was found during the solar eclipse, 19th, April, 1958. The maximum value occurred at the time of the maximum obscuration, and was over twice that on the other days. (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-14-021781
- OSTI ID:
- 4163772
- Journal Information:
- Denki Shikensho Iho (Japan) Changed to Denshi Gijutsu Sogo Kenkyusho Iho, Journal Name: Denki Shikensho Iho (Japan) Changed to Denshi Gijutsu Sogo Kenkyusho Iho Vol. Vol: 22; ISSN DESIA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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