[3E01-04] Environmental Radioactivity and Radiation

[3E01] Radiation measurements associated with lightning and thunderclouds in winter at the coastal area of the Japan Sea

*Harufumi Tsuchiya¹, Teruaki Enoto², Yuuki Wada^4,3, Yoshihiro Furuta³, Kazuhiro Nakazawa³, Takayuki Yuasa⁵, Kazufumi Okuda³, Kazuo Makishima⁴, Toshio Nakano⁴, Daigo Umemoto⁴ (1. JAEA, 2. Kyoto Univ., 3. Univ. of Tokyo, 4. RIKEN, 5. Singapore )

Keywords:lightning, thunderlcouds, particle acceleration, gamma rays, neurtons, positrons, radioactive isotopes

High-energy radiations associated with lightning and thunderclouds have been measued on the coastal area of the Japan Sea where ligning activity is high in winter season. In this presentation, based on our observations conducted until now, we explain how such raditions are produced. Then, we also report one peculiar event that lightning causes photonuclear reactions to generate neutron, positrons and radioactive isotopes of oxygen and carbon.