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| バックグラウンド放射線 | |||
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| バックグラウンド放射線 (bakku-guraundo-hōshasen); 自然放射線; 背景放射 | |||
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| Nuclear or ionizing radiations arising from within the body itself or from the environment to which individuals are constantly exposed. (FRA) | |||
| background: 1 phrase in 1 subject |
| Microsoft | 1 |