| 摘要 |
PURPOSE:To enable long-time measurement by piping and connecting main tank for liquid nitrogen and a reservoir tank, each equipped with a Ge semiconductor detector, a temperature detector, and a warning device, through a three- way diaphragm valve, and connecting both tanks to a high-voltage power source for the Ge semiconductor detector. CONSTITUTION:The three-way diaphragm valve V switches the flow direction VM of liquid nitrogen to the direction VR from the reservoir tank R or vice versa automatically with the signals generated when the temperature detectors TM and TR detect certain temperature to send the liquid nitrogen to the Ge semiconductor detector D. The signals of the temperature detectors TM and TR are sent to warning devices AM and AR, which generate a warning when the rest of the liquid nitrogen decreases below a constant value. Further, the high voltage power source S is disconnected from the Consequently, the amounts of liquid in the tanks M and R can be grasped and the long-time measurement is performed continuously.
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