| 摘要 |
PURPOSE:To sense the radiant ray emitted from the plant precisely by installing a pool, which is filled with water, below the detector to cut off the main natural background radiant ray and by measuring the quantity of radiant ray. CONSTITUTION:The radiant ray detector 1 is provided above the pool 3, which is filled with warm waste water, at the central position. The warm waste water 2 is fed from the feed pipe 4 to the pool and is overflowed and discharged from the drain pipe 5. The pool 3 i surrounded by the soil 6. In this way, when the radiant ray detector is installed at a height of 1-1.5m on the ground, the quantity of radiant ray detected by the detector is not influenced by the natural background radiant ray because the radiant ray from the activity of the soil is cut off even through the state of soil is varied.
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