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Compact Raman lidar measurement of liquid and vapor phase water under the influence of ionizing radiation

小型ラマンライダーによる放射線環境下の水ラマン計測

椎名 達雄*; 千明 倫之*; 斎藤 隼人*; 眞子 直弘*; 久世 宏明*; 羽生 敏紀; 金山 文彦; 福嶋 峰夫

Shiina, Tatsuo*; Chigira, Tomoyuki*; Saito, Hayato*; Manago, Naohiro*; Kuze, Hiroaki*; Hanyu, Toshinori; Kanayama, Fumihiko; Fukushima, Mineo

A compact Raman lidar has been developed for studying phase changes of water in the atmosphere under the influence of ionization radiation. The Raman lidar is operated at the wavelength of 349 nm and backscattered Raman signals of liquid and vapor phase water are detected at 396 and 400 nm, respectively. Alpha particles emitted from $$^{241}$$Am of 9 MBq ionize air molecules in a scattering chamber, and the resulting ions lead to the formation of liquid water droplets. From the analysis of Raman signal intensities, it has been found that the increase in the liquid water Raman channel is approximately 3 times as much as the decrease in the vapor phase water Raman channel, which is consistent with the theoretical prediction based on the Raman cross-sections. In addition, the radius of the water droplet is estimated to be 0.2 micro m.

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