| 摘要 |
PROBLEM TO BE SOLVED: To improve the effect of radiation shielding and the performance on the maintenance and inspections of a thermometer with a simple and compact structure of a shield, by connecting a shield whose inner diameter satisfies the performance of the insertion of a thermometer sheath and the effect of radiation shielding and which has the length required for shielding and is shaped like a pipe to a straight part at a tip of a guide tube. SOLUTION: A thermometer sheath guide tube 4 guiding a thermometer sheath 5 of a thermometer shaped like a sheath that measures the temperature of equipment and piping 7 placed in a high-level radiation area 1 to a low-level radiation area 2 is bored through a straight pipe into a shielding wall 3. A shield 9 for the sheath guide tube 4 is connected to a tip of the tube 4 in the bored part of the shielding wall 3 and is buried in it. The gap between the surface of the thermometer sheath 5 and the inner diameter of the shield 9, where an error in the manufacturing of the thermometer sheath 5 is taken into account, is set to satisfy the performance of insertion and extraction of the thermometer sheath 5 and the effect of intercepting the radiation from the high-level radiation area 1. In this way, the length of the sheath guide tube 4 is shortened and the bent part of it is lessened because the shielding wall 3 is pierced by the straight pipe.
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