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冬季雷活動時における放射線変動の観測とその特徴

Observation of energetic radiation associated with winter thunderstorm activity

鳥居 建男 ; 杉田 武志*; 村木 綏*

Torii, Tatsuo; Sugita, Takeshi*; Muraki, Yasushi*

近年、雷活動に起因すると考えられる放射線レベルの上昇が日本の冬季雷をはじめ、山岳雷や米国において夏季雷でも観測されている。本稿では、この放射線の特徴を把握すべく設置した比例計数管を検出器とする放射線測定器により、2006年冬季(2006年12月$$sim$$2007年2月)に発生した冬季雷の活動時に観測された高エネルギー放射線の観測結果とともに、周辺に設置されているモニタリングポストの測定結果との比較、及び電場計による雷活動との相関についてこれまで得られた知見について述べる。

$$gamma$$-ray dose-rate increase associated with thunderstorm activities was observed on the ground in winter. To investigate the fluctuation profile during winter thunderstorms, the energetic radiation was measured by using four set of radiation detectors (LPRCs) which consist of four long proportional counters (2.5 m in length; 10 cm in diameter). These LPRC have a different response characteristic for the incident particle by mounting shield covers. It was also compared with the result measured at the same time by the environmental radiation monitors adopting an NaI scintillator / ionization chamber as a detector. Moreover, the electric field was measured at the same site by using a field mill. In the observation from December, 2006 to February, 2007, the count-rate fluctuation which seem to originate from thunderstorm activity observed by the LPRCs.

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