| 摘要 |
PURPOSE:To obtain a radiation detector whose sensitivity and resolution are excellent, by detecting a current flowing to a superconductor of a superconductive tunnel junction, in a state that a potential difference across said superconductor is kept constant. CONSTITUTION:A potential difference across a superconductor 1 of a superconductive tunnel junction is detected through terminals 6, 7, and a current is made to flow between current terminals 8, 9 so that its potential difference becomes constant by a constant-voltage power source 3. When a radiant ray is made incident on the superconductor 1 in such a state, its current value is varied, therefore, by detecting its variation by a resistance 5, the radiant ray is detected. In this way, the radiant ray can be detected with a high accuracy.
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