Altitude and Spatial Angle Dependences of Natural and Secondary Cosmic Ray Radiations on Terrestrial Electronic Devices
スポンサーリンク
概要
- 論文の詳細を見る
For the purpose of studying the radiation effects on electronic devices on the ground, observations of total-time radiation counts of natural and secondary cosmic rays up to an energy of 12 MeV were carried out at two locations with different altitudes: Chofu (53 m) and Sugadaira (1313 m) in Japan, using a multichannel analyzer (MCA) with a NaI detector. Sugadaira recorded more counts by 15% for the natural rays and by 20% for the cosmic rays than Chofu. This small increasing rate in cosmic rays compared with a 3-times increase in the soft error rate (SER) that is predicted at the altitude at Sugadaira suggested that the SER might originate from the higher energy neutrons above 12 MeV, which account for only 3% (0.3 counts$\cdot$h-1$\cdot$cm-2) of the effect below 12 MeV in the neutrons reaching the ground. Moreover, the spatial angle dependences of radiation were investigated by changing the angle between the NaI detector tube and the ground plane, and it was found that in the center of the direction parallel to the ground plane, the counts indicated a maximum immediately under the ground plane for the natural rays, and a maximum at the zenith for the cosmic rays.
- 2008-11-25
著者
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Kawano Katsuyasu
Department Of Applied Physics Osaka City University:absence Of The University Of Electro-communicati
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Tomizawa Ichiro
Sugadaira Space Radio Observatory (SSRO), The University of Electro-Communications, Sanada, Nagano 386-2201, Japan
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Deguchi Masahiro
Department of Electronic Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
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Mishima Kenta
Department of Electronic Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
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Kawano Katsuyasu
Department of Electronic Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
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